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. 2015 Mar 5;12(4):918–928. doi: 10.1111/mcn.12174

Gestational weight gain and obesity, adiposity and body size in African–American and Dominican children in the Bronx and Northern Manhattan

Elizabeth M Widen 1,2,3,, Robin M Whyatt 4, Lori A Hoepner 4, Noel T Mueller 2,3, Judyth Ramirez‐Carvey 4, Sharon E Oberfield 5, Abeer Hassoun 5, Frederica P Perera 4, Dympna Gallagher 1,2, Andrew G Rundle 3
PMCID: PMC4561015  NIHMSID: NIHMS698214  PMID: 25753294

Abstract

Gestational weight gain (GWG) is potentially modifiable and is associated with infant size and body composition; however, long‐term effects on childhood obesity have not been reported among multi‐ethnic urban populations. We examined the association between GWG and child anthropometric measures and body composition at 7 years [waist circumference (WC), body mass index z‐score (BMIZ), obesity (BMIZ ≥95%ile) and bioelectrical impedance analysis estimates of percentage body fat (%fat)] in African–American and Dominican dyads (n = 323) in the Columbia Center for Children's Environmental Health prospective birth cohort study from 1998 to 2013. Linear and logistic regression evaluated associations between excessive GWG [>Institute of Medicine (IOM) 2009 guidelines] and outcomes, adjusting for pre‐pregnancy BMI and covariates. Pre‐pregnancy BMI (mean ± standard deviation, all such values) and total GWG were 25.8 ± 6.2 kg m−2 (45% overweight/obese) and 16.4 ± 7.9 kg (64% > IOM guidelines), respectively. Excessive GWG was associated with higher BMIZ {0.44 [95% confidence interval (CI): 0.2, 0.7], P < 0.001}, WC [β: 2.9 cm (95% CI: 1.1, 4.6), P = 0.002], %fat at 7 years [β: 2.2% (95% CI: 1.0, 3.5), P = 0.001)] and obesity [odds ratio: 2.93 (95% CI: 1.5, 5.8), P = 0.002]. Pre‐pregnancy BMI was positively associated with child size, adiposity and obesity (all P < 0.05). Excessive GWG was highly prevalent and was associated with child obesity, greater percentage body fat and abdominal adiposity. Strategies to support healthy GWG are warranted to promote healthy growth and prevent childhood obesity.

Keywords: pregnancy, weight gain, life course, childhood adiposity, childhood obesity, body composition

Introduction

Childhood overweight and obesity remains pervasive in the United States and globally (Black et al. 2013; Ogden et al. 2014; Skinner & Skelton 2014), and stems from multiple individual, proximal and distal causes. The intrauterine environment contributes to metabolic programming (Gluckman et al. 2008; Dahly et al. 2009) and therefore health (and obesity risk) across the life course. Maternal nutritional status in pregnancy is an indicator of the intrauterine environment (Kuzawa & Adair 2004; Dahly et al. 2009; Bollen et al. 2013). Gestational weight gain (GWG), in particular, is a measurable and potentially modifiable marker of nutritional availability to the growing foetus (Kuzawa & Adair 2004; Dello Russo et al. 2013) and is associated with both short and potentially longer term health of mother and child. Therefore, the Institute of Medicine (IOM) recommends that pregnant women gain weight within ranges according to pre‐pregnancy body mass index (BMI) in order to optimize prenatal, birth and possibly longer term health outcomes (Institute of Medicine 2009).

Recent studies suggest that both total (continuous, kg) and excessive GWG (defined as exceeding the IOM recommendations) are positively associated with adiposity in the neonatal period and infancy (Crozier et al. 2010; Hull et al. 2011; Deierlein et al. 2012), and these effects may persist into childhood (Crozier et al. 2010; Fraser et al. 2010; Ludwig & Currie 2010; Schack‐Nielsen et al. 2010; Lawlor et al. 2011; Hinkle et al. 2012; Margerison‐Zilko et al. 2012; Stamnes Kopp et al. 2012; Dello Russo et al. 2013; Ensenauer et al. 2013). However, most studies examining longer term effects of GWG on childhood size typically only have measures of height and weight rather than estimates of body composition (Crozier et al. 2010; Hinkle et al. 2012; Margerison‐Zilko et al. 2012). Further, evidence of long‐term effects of GWG is limited in vulnerable populations, such as low‐income multi‐ethnic cohorts, who may be at increased risk of obesity and associated sequelae.

In the Columbia Center for Children's Environmental Health (CCCEH) prospective birth cohort, we investigated the association between GWG and childhood size, body composition and obesity in African–American and Dominican youth at 7 years. We hypothesized that excessive GWG (>IOM guidelines) and total GWG (continuous, kg) are associated with offspring obesity and increased adiposity, and further that pre‐pregnancy BMI modifies these associations (Fig. 1).

Figure 1.

figure

Conceptual framework. BMI, body mass index.

Key messages.

  • Maternal pre‐pregnancy body mass index (BMI) and excess pregnancy weight gain are associated with risk of childhood obesity; but there is limited evidence regarding the effects of pregnancy weight gain on childhood body composition, especially in low‐income populations.

  • Pre‐pregnancy body mass index (BMI) and excess pregnancy weight gain was associated with higher total body fat, abdominal fat and BMI in childhood.

  • Excess pregnancy weight gain was associated with a very high risk of childhood obesity.

  • Interventions to prevent excess pregnancy weight gain may reduce the risk of obesity in the child.

Methods

Data are from the CCCEH Mothers and Newborns Study in Northern Manhattan and the South Bronx, New York, a prospective birth cohort that has been previously described (Perera et al. 2003; Whyatt et al. 2003). From 1998 to 2006, 727 mothers self‐identifying as African–American or Dominican were enrolled during the third trimester of pregnancy if they had resided in the study area for at least 1 year. Women were excluded if the first prenatal visit was after 20 weeks gestation or if the mother self‐reported diabetes, hypertension, known human immunodeficiency virus status or use of illicit drugs or cigarettes during pregnancy.

Self‐report of pre‐pregnancy weight, maternal education, receipt of public assistance, ability to afford food in pregnancy and previous pregnancies was obtained at the baseline interview during the second or third trimester. At delivery, maternal and infant medical records were abstracted by research staff to ascertain prenatal medical history, birth outcomes and the last prenatal visit weight. Maternal report of breastfeeding was obtained at follow‐up visits at 3, 6, 12 and 24 months. Maternal height was obtained by self‐report at the baseline prenatal interview, measured in the medical record and at subsequent study visits measured with a stadiometer (before January 2010: Cardinal Scale Manufacturing Company, Webb City, MO, USA; after January 2010: Holtain Limited, Crymych, UK). Prenatal self‐report, medical record and post‐partum study visit measured heights were compared with each other. If height values were discrepant, a data‐cleaning algorithm along with verification of original study documents was used to recode maternal height. If the algorithm identified a systematic conversion error from data entry, study documents were reviewed to confirm and if identified, the value was recoded (i.e. 5′6″ self‐report and 56″ data entered: recoded to 66″). If medical record and self‐reported heights were within ±2.54 cm, the self‐reported heights were retained. If medical record and self‐reported heights were within ±2.55–5.08 cm, the two height measurements were (i) averaged if no subsequent measured height measurements were available and (ii) if other values were available, the height values within ±5.08 cm were averaged. Finally, if height values were greater than ±5.09 cm different, study charts were reviewed for accuracy and values within ±5.08 cm were averaged.

Total GWG was determined by subtracting the last prenatal visit weight from the pre‐pregnancy weight. GWG percent adequacy was determined by dividing the observed total GWG by the expected GWG [GWG percent adequacy = (observed total GWG/expected GWG) × 100], where expected GWG = IOM recommended first trimester gain + (gestational age − 13 weeks) × recommended rate of GWG for the second and third trimesters (Institute of Medicine 2009). IOM recommended first trimester gains used to calculate expected GWG were 2 kg for underweight and normal weight women, 1 kg for overweight women and 0.5 kg for obese women (Bodnar et al. 2011; Institute of Medicine 2009). Ratios exceeding the 2009 Institute of Medicine (IOM) recommended ranges for each pre‐pregnancy BMI group were coded as excessive GWG as previously described (Bodnar et al. 2011; Mehta et al. 2011; Deierlein et al. 2012). This approach for estimating adherence to the IOM recommendations reflects that longer gestations may have greater weight gain.

Child measurements were conducted at 7.1 ± 0.2 years from 2005 to 2013. Children wore light clothing and no shoes. Weight and height were obtained by a digital scale/stadiometer (Cardinal Scale Manufacturing Company) until January 2010. After January 2010, height was obtained with the Holtain‐Harpenden Wall Mounted Stadiometer Counter 602VR (Holtain Limited). Waist circumference (WC) was measured halfway between the iliac crest and the lowest rib to the nearest 0.5 cm using non‐stretchable tape. Bioelectrical impedance estimates of percentage body fat (%fat) were obtained with the Tanita Digital Body Mass Indicator Scale BC‐418 (Tanita Corporation of America, Arlington Heights, IL, USA). Child BMI z‐scores were determined using the SAS programs provided by the Centers for Disease Control and Prevention (CDC 2014); BMI z‐scores reflect age‐ and sex‐specific standard deviations from the mean values in the CDC 2000 growth charts. For example, a BMI z‐score of +1.0 indicates one standard deviation above the mean.

Study procedures at enrollment and follow‐up were approved by the Columbia University Institutional Review Board. Written informed consent was obtained by all enrolled women, and written assent was obtained from children at 7 years.

Statistical analysis

Statistical analyses were conducted with Stata 12.0 (College Station, TX, USA) with an alpha of 0.05 for statistical tests. Baseline characteristics were compared between included and excluded dyads using parametric tests for continuously, normally distributed variables and non‐parametric tests as appropriate.

Multivariable linear and logistic regression models were used to assess the association between GWG and the following childhood outcomes at 7 years: offspring size, childhood body composition and obesity (BMIZ > 95%ile). GWG was modelled as both total gain (continuous variable, kg) and adequacy of GWG [dichotomous variable: excessive/not excessive (referent)] (Institute of Medicine 2009). Effect modification was evaluated using interaction terms for GWG exposures and (i) pre‐pregnancy BMI, modelled as a continuous variable, and (ii) infant sex with an alpha of 0.1 (Marshall 2007). No effect modification was observed; thus, both infant sex and pre‐pregnancy BMI were included as covariates in all models. Other covariates included maternal education (>12 years, yes/no), maternal race/ethnicity (categorical), receipt of public assistance (yes/no), ability to afford food in pregnancy (yes/no), parity (continuous), prenatal demoralization (i.e. psychological distress, previously described; Wallace et al. 2003; Reyes et al. 2011) (score >1.55 coded as high, yes/no) and child age at measurement (months, continuous). Gestational age at the last measured weight was also included in the total GWG models (weeks, continuous). Models were initially controlled for marital status, which did not influence observed associations; thus, it was not included in the final adjustment set. For all models, only effect estimates for primary exposures (GWG) and pre‐pregnancy BMI are presented in order to limit potential misunderstandings of secondary effects (defined as a ‘table 2 fallacy’) (Westreich & Greenland 2013). The models are presented as follows: model 1 (unadjusted model with GWG, pre‐pregnancy BMI and gestational age) and model 2 (GWG, pre‐pregnancy BMI, gestational age and all covariates).

It is important to note that the last measured pregnancy weight abstracted from the medical record was missing in some women and was not always obtained in close proximity to delivery. Of women with pre‐pregnancy weight, covariates and childhood data, 323 women had prenatal weights obtained within 4 weeks of delivery, which were obtained on average 4 days prior to delivery [median: 3 (interquartile range: 1–6 days)]. Sensitivity analyses were conducted assessing whether exclusion of women with weights obtained 7–28 days (n = 53) before delivery influenced observed associations in multivariable models. In addition, analyses were conducted using inverse probability weights for successful follow‐up at 7 years to assess the effects of sample attrition and incomplete follow‐up on effect estimates as previously described in this cohort (Rundle et al. 2012; Mueller et al. 2014). Briefly, analyses using IPW allow for estimation and correction for bias due to incomplete follow‐up and missing data, which can bias results if attrition or missing data were differential by primary exposure or important covariates (Hernan et al. 2004). A logistic regression model was used to estimate the covariate‐adjusted probability of successful follow‐up using baseline data from this cohort; the model used for estimating the predicted probability of follow‐up included the following variables: pre‐pregnancy obesity, parity, total pregnancy weight gain (GWG), race/ethnicity, maternal age, education, parity, linguistic isolation, neighbourhood poverty rate, birthweight, child sex, receiving public assistance and an indicator variable for missing income data. The inverse of the predicted probability of follow‐up (IPW) was used for sample weighting in subsequent analyses. Logistic and linear regression models assessing effects between GWG and child outcomes were re‐analysed with weighting by IPW for follow‐up using the survey command in Stata 12.0.

Results

Table 1 shows baseline characteristics and risk factors for the overall cohort with GWG data and for children included in this analysis at age 7. Data on body composition and key covariates were available for 323 dyads. The primary missing data element was childhood measurements (Fig. 2). Most characteristics were similar between those included (n = 323) and excluded from this analysis (n = 201); however, compared with those excluded from the analytic sample, a smaller proportion of included mothers were Dominican and a larger proportion were African–American (Table 1, P = 0.005).

Table 1.

Sample characteristics*

Characteristic Enrolled cohort with pregnancy weight gain data Excluded due to missing childhood or covariate data Analytic sample
(n = 524) (n = 201) (n = 323)
Prenatal maternal
Pre‐pregnancy BMI, kg m−2 25.6 ± 5.9 25.3 ± 5.3 25.8 ± 6.2
Pre‐pregnancy BMI, n (%)
Underweight 27 (5.2) 11 (5.5) 16 (5.0)
Normal 266 (50.8) 101 (50.3) 165 (51.1)
Overweight 122 (23.3) 52 (25.9) 70 (21.7)
Obese 109 (20.8) 37 (18.4) 72 (22.3)
Total GWG, kg 16.7 ± 7.7 17.1 ± 7.4 16.4 ± 7.9
Excessive total GWG , n (%) 341 (65.1) 134 (66.7) 207 (64.1)
Primiparous, n (%) 131 (25.0) 47 (23.4) 84 (26.0)
Ethnicity
Dominican, n (%) 334 (63.7) 143 (71.1) 191 (59.1)
African–American, n (%) 190 (36.3) 58 (28.9) 132 (40.9)
Maternal education >12 years, n (%) 152 (29.0) 55 (27.4) 97 (30.0)
Received public assistance, n (%) 213 (40.7) 85 (42.3) 128 (39.6)
Unable to afford food, n (%) 91 (17.4) 37 (18.4) 54 (16.7)
Demoralization, score 1.1 ± 0.63 1.2 ± 0.63 1.1 ± 0.63
Demoralization >1.55, n (%) 133 (25.4) 50 (24.9) 83 (25.7)
Post‐natal child
Birthweight, kg 3.3 ± 0.45 (514) 3.4 ± 0.44 (191) 3.4 ± 0.46 (323)
Breastfeeding duration, week 10.2 ± 13.5 (470) 7.7 ± 10.6 (147) 11.3 ± 14.5 (323)
Male, n (%) 246 (47.0) 100 (49.8) 146 (45.2)

BMI, body mass index; GWG, gestational weight gain. *Mean ± standard deviation (SD) (n) or mean ± SD, all such values. GWG > Institute of Medicine 2009 Guidelines.

Figure 2.

figure

Participant flow diagram. GWG, gestational weight gain.

At 7 years, 71 (22% of 323) of children were obese; mean percentage body fat was 24.1 ± 5.8% (7.2 ± 3.8 kg of fat mass) (Table 2). Table 3 shows the multivariable associations between excessive GWG, covariates and childhood outcomes. Excessive GWG was associated with higher child BMI z‐score, percentage body fat and larger WC. Pre‐pregnancy BMI was positively associated with childhood size outcomes (WC, percentage body fat and BMI z‐score); these estimates are the effect of a 5‐kg m−2 increase in pre‐pregnancy BMI on child outcomes, controlling for the average effect of GWG (Westreich & Greenland 2013). Associations were similar in models with continuous total GWG, where higher total GWG was associated with larger childhood size outcomes. For example, every 5‐kg increase in total GWG was associated with a 0.11 higher child BMIZ {β = 0.11 [95% confidence interval (CI): 0.03, 0.18], P < 0.01}, 0.71% higher body fat [β = 0.71 (95% CI: 0.32, 1.10), P < 0.001] and 0.95 cm greater WC [β = 0.95 (95% CI: 0.41, 0.1.50), P = 0.001].

Table 2.

Child anthropometry and body composition at 7 years

Characteristic All Male Female
n = 323 n = 146 n = 177
Weight, kg 28.3 ± 7.0 28.7 ± 6.9 27.9 ± 7.2
Height, cm 125.2 ± 5.7 125.9 ± 5.2 124.5 ± 5.9
BMIZ 0.80 ± 1.1 0.86 ± 1.1 0.74 ± 1.1
Waist circumference, cm 58.6 ± 8.0 59.0 ± 8.44 58.1 ± 7.6
Fat mass, kg 7.2 ± 3.8 7.0 ± 3.9 7.3 ± 3.7
Fat‐free mass, kg 21.1 ± 3.7 21.7 ± 3.4 20.6 ± 3.8
Percentage fat, % 24.1 ± 5.8 23.0 ± 6.0 25.1 ± 5.5

Mean ± standard deviaiton, all such values. BMIZ, body mass index z‐score.

Table 3.

 Associations of gestational weight gain and prenatal factors with childhood size and body composition at 7 years (n = 323)*

BMIZ % Body fat Waist circumference, cm
I* II I II I II
β (95% CI) β (95% CI) β (95% CI) β (95% CI) β (95% CI) β (95% CI)
Excessive GWG model
Excessive GWG 0.43 (0.18, 0.67) 0.44 (0.20, 0.68) 2.09 (0.81, 3.38) 2.23 (0.97, 3.49) 2.81 (1.02, 4.60) 2.85 (1.07, 4.62)
Pre‐pregnancy BMI , 5 kg m−2 0.26 (0.16, 0.35) 0.29 (0.19, 0.39) 1.15 (0.65, 1.64) 1.20 (0.70, 1.70) 1.31 (0.62, 2.00) 1.60 (0.89, 2.30)
Total GWG model
Total GWG § , kg 0.02 (0.01, 0.04) 0.02 (0.01, 0.04) 0.13 (0.05, 0.21) 0.14 (0.06, 0.22) 0.18 (0.07, 0.29) 0.19 (0.08, 0.30)
Pre‐pregnancy BMI , 5 kg m−2 0.31 (0.22, 0.41) 0.30 (0.21, 0.40) 1.37 (0.87, 1.88) 1.50 (0.99, 2.00) 1.69 (0.98, 2.39) 1.98 (1.27, 2.70)

β, beta coefficient; BMI, body mass index; CI, confidence interval; GWG, gestational weight gain. *Model I includes GWG, pre‐pregnancy BMI and gestational age; model II (fully adjusted) includes model I and covariates [parity (continuous), child age (months), maternal race/ethnicity (categorical), maternal education >12 years (yes/no, categorical), child sex (categorical), receipt of public assistance (yes/no), prenatal demoralization score >1.55 (yes/no) and ability to afford food in pregnancy (yes/no)]. Adequate/inadequate GWG was the reference group. Pre‐pregnancy BMI was modelled as a continuous variable; effects shown are per 5 kg m−2 increase in pre‐pregnancy BMI. §Total GWG modelled as a continuous variable; effects shown are per 1‐kg increase in GWG.

Excessive GWG was associated with an almost 300% increased risk of childhood obesity (BMIZ > 95%ile), while every 1‐kg increase in total GWG (continuous, kg) was associated with a 4% higher risk of child obesity (Table 4). Controlling for the average effect of GWG, every 5‐kg m−2 increase in pre‐pregnancy BMI was positively associated with a 50% increase in child obesity risk at 7 years.

Table 4.

 Risk of child obesity at age 7 years according to gestational weight gain and prenatal factors (n = 323)*

Obesity risk

(BMIZ > 95%ile)

I*

RR (95% CI)

II

RR (95% CI)

Excessive GWG model
Excessive GWG 2.75 (1.43, 5.29) 2.93 (1.49, 5.75)
Pre‐pregnancy BMI , 5‐kg m−2 1.31 (1.07, 1.61) 1.40 (1.12, 1.75)
Total GWG model
Total GWG § , kg 1.07 (1.03, 1.12) 1.04 (1.01, 1.08)
Pre‐pregnancy BMI , 5‐kg m−2 1.41 (1.14, 1.74) 1.53 (1.21, 1.92)

BMI, body mass index; CI, confidence interval; GWG, gestational weight gain; RR, risk ratio. *Model I includes GWG (total or excessive), pre‐pregnancy BMI (continuous) and gestational age (weeks) for total GWG model; model II (fully adjusted) includes model I and covariates [parity (continuous), child age (months), maternal race/ethnicity (categorical), maternal education >12 years (yes/no), child sex, receipt of public assistance (yes/no), ability to afford food in pregnancy (yes/no) and high prenatal demoralization (yes/no)]. Adequate/inadequate GWG was the reference group. Pre‐pregnancy BMI was modelled as a continuous variable; effects shown are per 5 kg m−2 increase in pre‐pregnancy BMI. §Total GWG modelled as a continuous variable; effects shown are per 1‐kg increase in GWG.

We conducted further analyses to assess whether the results were sensitive to the timing of GWG measurement relative to delivery. In total, 53 women in the analytic sample (16%) had last prenatal weights obtained within 1–4 weeks prior to delivery (mean = 1.8 ± 0.69 weeks prior to delivery; range: 1.1–3.7 weeks). After excluding women with weight measurements obtained within 1–4 weeks of delivery, associations between GWG and childhood weight and body composition outcomes were essentially the same or were negligibly different from observed associations in the larger cohort (data not shown).

Analyses were also conducted using inverse probability weights for successful follow‐up at 7 years to assess for effects of sample attrition and incomplete follow‐up on effect estimates.

Calculation of IPW for follow‐up at age 7 showed that parity, birthweight, black race and maternal age were associated with successful follow‐up, while pre‐pregnancy obesity, GWG, maternal education, linguistic isolation, receiving public assistance, poverty rate and missing income data were not associated with follow‐up (all P > 0.15). Weighting the data for successful follow‐up did not appreciably alter associations between GWG and childhood outcomes (data not shown).

Discussion

To our knowledge, this is the first study to characterize long‐term effects of GWG in a contemporary low‐income multi‐ethnic urban cohort, a population characterized by a high risk of obesity and associated consequences. Our findings suggest that weight gain in pregnancy greater than the IOM's recommendations is strongly associated with obesity in childhood; children of mothers with excessive GWG had almost a 300% increased odds of obesity [odds ratio (OR): 2.93; 95% CI: 1.49, 5.75]. In our study, as expected, higher pre‐pregnancy BMI was positively associated with higher BMIZ and obesity in childhood.

Our results are generally consistent with previous studies reporting associations between total/excessive GWG and childhood obesity and body composition (Crozier et al. 2010; Fraser et al. 2010; Schack‐Nielsen et al. 2010; Lawlor et al. 2011; Hinkle et al. 2012; Margerison‐Zilko et al. 2012; Ensenauer et al. 2013). However, in our cohort, the effects of excessive GWG on childhood obesity (300% increased risk) were stronger than other reports, where obesity risk was increased by ∼30–60%. This likely reflects sample differences and highlights the importance of supporting healthy GWG in populations similar to ours. Previously, in a nationally representative sample of predominately normal weight mothers (n = 3600, 64% normal weight, 34% overweight/obese) in the United States, excessive GWG (>2009 IOM guidelines) was associated with higher BMIZ at 5 years, but only in offspring of mothers with normal and overweight pre‐pregnancy BMI (Hinkle et al. 2012). In another diverse United States‐based cohort (n = 3015; 24% overweight/obese), total GWG was positively associated with childhood overweight (Margerison‐Zilko et al. 2012). Excessive GWG was also associated with increased odds of childhood overweight (BMIZ > 85%ile) [OR: 1.27 (95% CI: 1.10–1.48)] (Margerison‐Zilko et al. 2012). Similarly, in a subset of the ALSPAC Study, a United Kingdom‐based cohort (n = 5114; 69% normal weight, 17% overweight, 7% obese pre‐pregnancy), excessive GWG (>2009 IOM guidelines), was associated with 1075 g (95% CI: 773, 1378) greater fat mass in children (measured by dual‐energy X‐ray absorptiometry) compared with women gaining within the recommendations (Fraser et al. 2010). Early GWG (<14 weeks) was incrementally associated with offspring fat mass among all women, but only later GWG (between 14 and 36 weeks) was associated with greater offspring fat mass among women gaining >500 g week−1 (Fraser et al. 2010). Prevalence of pre‐pregnancy obesity in this cohort was only 7% (Fraser et al. 2010); therefore, these findings may not be fully generalizable to our findings, as pre‐pregnancy weight status is associated with the magnitude and composition of GWG (Lederman et al. 1997; Butte et al. 2003). In a European cohort (n = 12 775) high total GWG was associated with 0.34 (95% CI: 0.28–0.40, P < 0.01) higher BMIZ in childhood (ages 2–9 years) and risk of child obesity [OR: 1.33 (95% CI: 1.09–1.62)] (Dello Russo et al. 2013). In this cohort, reliable estimates of pre‐pregnancy BMI were not available (Dello Russo et al. 2013). In predominately normal weight German mothers (n = 6837) (26% overweight/obese), excessive GWG (>2009 IOM guidelines) was associated with child overweight [OR 1.57 (95% CI: 1.30–1.91)] and abdominal adiposity (WC > 90%ile) [OR: 1.39 (95% CI: 1.19, 1.63)] (Ensenauer et al. 2013). In the University of Southampton Women's Study (n = 948) (43% overweight/obese), excessive GWG (>2009 IOM) was associated with childhood fat mass at 6 years [β: 0.30 (95% CI: 0.11, 0.49)] (Crozier et al. 2010).

Consistent with previous reports a majority of women in our analytic sample gained above the current IOM recommendations (Institute of Medicine 2009; Centers for Disease Control and Prevention 2012). However, the proportion of women in our sample who gained above the guidelines (64%) was higher than most other reports (Centers for Disease Control and Prevention 2012; Sangi‐Haghpeykar et al., 2014). Based on data from the CDC Pregnancy Nutrition Surveillance System, which collects data from low‐income women in federally funded maternal and child health programmes, prevalence of excessive GWG among black, non‐Hispanic women was approximately 48% (range: 47.7–48.7%), and was approximately 43% for Hispanic women (range: 42.4–44.5%) for the years 2002–2011 (Centers for Disease Control and Prevention 2012). Mean total GWG in our cohort (16.4 ± 7.9 kg) was similar to another cohort of African–American women (n = 47) in New York City (17.4 ± 5.6 kg), where about two‐third of all women and all overweight/obese women gained above the 1990 IOM recommendations (Lederman et al. 2002).

This study has limitations that should be noted. Pre‐pregnancy weight was obtained by self‐report. Previously, in a multi‐ethnic cohort of New York women, self‐report of pre‐pregnancy weight was highly correlated with measured weights across BMI categories (r = 0.92–0.99) and was only significantly different in underweight women (Lederman & Paxton 1998); but in other non‐pregnant populations there is evidence that weight under‐reporting weight varies by ethnicity (Wen & Kowaleski‐Jones 2012; Richmond et al. 2014). If weight was underreported, our estimates of pre‐pregnancy BMI would be underestimated and GWG would be overestimated (Deierlein et al. 2011). Because of the insufficient sample size, we were unable to evaluate for heterogeneity by pre‐pregnancy BMI, which has been observed in some previous reports (Hinkle et al. 2012; Margerison‐Zilko et al. 2012) but not others (Fraser et al. 2010; Deierlein et al. 2012). Moreover, the last prenatal weight measurement was not available for some women within 1 week of delivery; thus, we conducted a sensitivity analysis excluding women with last prenatal weights obtained 1–4 weeks before delivery. In this analysis, we found that the results were essentially unchanged. As with any longitudinal study, we had sample attrition and missing data. Reanalysis of the data using inverse probability weighting for successful follow‐up suggests that incomplete follow‐up did not bias the results. Lastly, childhood body composition was assessed with bioelectrical impedance analysis, which has been validated in some populations but has not been compared with gold standard reference methods in a population of African–American and Dominican children similar to ours (Xie et al. 1999; Jebb et al. 2000; Pietrobelli et al. 2004; Haroun et al. 2009); yet, similar associations were observed for all outcomes (BMIZ, WC and %fat from bioelectrical impedance analysis).

In conclusion, GWG above the IOM recommendations was associated with a markedly increased risk of child obesity. Total GWG was positively associated with childhood size and adiposity, but only marginally associated with obesity. These results suggest that effects of excessive GWG persist into childhood; thus, supporting controlled and healthy GWG is essential to promote healthy growth in childhood and thereafter. The strengths of our study include a prospective cohort design, medical record report of GWG and use of body composition measurements in childhood. As previously mentioned, this is one of the first studies to report long‐term effects of GWG on childhood fatness and obesity in a multi‐ethnic urban and predominately low‐income cohort. We were able to adjust for potential confounders including socio‐economic status and psychosocial health in pregnancy. Future studies with measurement of maternal body composition changes in pregnancy and childhood adiposity measures may provide further insight to mechanisms underlying these associations.

Source of funding

This study was also supported by the Irving General Clinical Research Center (grant RR00645), the Educational Foundation of America, the John and Wendy Neu Family Foundation, the New York Community Trust and the Trustees of the Blanchette Hooker Rockefeller Fund. Finally, NTM and EMW received fellowships from the National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK T32DK091227‐03). This publication was made possible by the National Institute for Environmental Health Sciences (NIEHS) grants 1RC2ES018784 and P01 ES09600 and US Environmental Protection Agency (US EPA) grants R82702701, RD832141, RD83450901.

Conflicts of interest

The authors declare that they have no conflicts of interest.

Contributions

RMW, AGR and FPP contributed to the original cohort design; RMW, AGR and LAH contributed to the design of the age 7 wave of follow up; JRC: contributed to data collection; LAH: contributed to database management; LAH, EMW, NTM, AGR: contributed to data cleaning; AGR, EMW, NTM, SEO, AH and DG: contributed to interpretation of the data; EMW: designed and performed this analysis, wrote the manuscript and has primary responsibility for the final content. All authors reviewed all versions of the manuscript and contributed to the intellectual content of the manuscript.

Acknowledgements

We would like to thank the CCCEH participants and research team, especially Virginia Rauh, Greg Freyer, Howard Andrews, Deliang Tang, Diurka Diaz, Fred Hua and Darrell Holmes. Its contents are solely the responsibility of the grantee and do not necessarily represent the official views of the US EPA. Further, the US EPA does not endorse the purchase of any commercial products or services mentioned in the publication.

Widen, E. M. , Whyatt, R. M. , Hoepner, L. A. , Mueller, N. T. , Ramirez‐Carvey, J. , Oberfield, S. E. , Hassoun, A. , Perera, F. P. , Gallagher, D. , and Rundle, A. G. (2016) Gestational weight gain and obesity, adiposity and body size in African–American and Dominican children in the Bronx and Northern Manhattan. Maternal & Child Nutrition, 12: 918–928. doi: 10.1111/mcn.12174.

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