TABLE 2.
Description of Infant Feeding Practices
| Breastfeeding Variables | Overall, n = 8134 | Underweight, n = 207 | Healthy Weight, n = 3727 | Overweight, n = 2115 | Obese, n = 2085 |
|---|---|---|---|---|---|
| Ever breastfed the child | |||||
| No | 768 (9.4%) | 20 (9.7%) | 291 (7.8%) | 172 (8.1%) | 285 (13.7%) |
| Yes | 7366 (90.6%) | 187 (90.3%) | 3436 (92.2%) | 1943 (91.9%) | 1800 (86.3%) |
| Duration of any breastfeeding, wks | |||||
| n | 3652 | 102 | 1707 | 959 | 884 |
| Median (25th, 75th percentile) | 24 (8 to 52) | 18.75 (6 to 48) | 26 (12 to 52) | 24 (8 to 52) | 17.3 (5.0 to 39) |
| Range, wks | 0 to 282 | 0 to 130 | 0 to 208 | 0 to 282 | 0 to 260 |
| Duration of exclusive breastfeeding (confirmed no formula), wks* | |||||
| n | 1990 | 51 | 902 | 512 | 525 |
| Median (25th, 75th percentile) | 17.3 (4 to 26) | 12 (3 to 24) | 20 (8 to 26) | 17.3 (4 to 28) | 12 (2 to 26) |
| Range, wks | 0 to 208 | 0 to 104 | 0 to 208 | 0 to 156 | 0 to 186 |
| Exclusive breast feeding through 3 mo of age* | |||||
| No | 1413 (17.4%) | 45 (21.7%) | 535 (14.4%) | 375 (17.7%) | 458 (21.9%) |
| Yes | 878 (10.8%) | 13 (6.3%) | 454 (12.2%) | 232 (11.0%) | 179 (8.6%) |
| Missing/unknown | 5843 (71.8%) | 149 (72.0%) | 2738 (73.4%) | 1508 (71.3%) | 1448 (69.5%) |
*
We define “exclusive breastfeeding” at 3 months as a report of breastfeeding and confirmation of no formula feeding. Supplement use (eg, fluoride, iron, vitamin D, multivitamins, fish oil, DHA, EPA, prebiotics, probiotics, other vitamins, human milk fortifier) is included, and information on supplement use and complementary or solid food intake may be missing. Maternal pre-pregnancy BMI categories were underweight (BMI <18.5 kg/m2), healthy weight (18.5 ≤ BMI <25 kg/m2), overweight (25 ≤ BMI <30 kg/m2) and obese (BMI ≥30 kg/m2).