Table 3.

Mean and range of early gestational weight gain by pre-pregnancy BMI and the IOM weight gain recommendations [mean (range) in kg] based on self-reported pre-pregnancy BMI

	Underweight (<18.5 kg/m2) n = 125	Normal weight (BMI 18.5–24.9 kg/m2) n = 1209	Overweight (BMI 25.0–29.9 kg/m2) n = 418	Obese (BMI ≥ 30 kg/m2) n = 229
IOM weekly weight gain recommendation (kg)	0.51 (0.44–0.58)	0.42 (0.35–0.50)	0.28 (0.23–0.33)	0.22 (0.17–0.27)
Weekly weight gain (kg)	0.41 (−1.00–2.60)	0.38 (−2.00–10.00)	0.45 (−8.00–8.00)	0.46 (−2.00–6.33)

IOM Institute of Medicine; BMI Body mass index; kg kilograms