Recommended for total and rate of weight gain during pregnancy by pre-pregnancy BMI

Total weight gain

Rates of weight gain

2nd and 3rd trimester

Prepregnancy BMI

Range in kg

Range in lbs

Mean (range) in kg/week

Mean (range) in lbs/week

Underweight (<18.5 kg/m2)

12.5-18

28-40

0.51 (0.44-0.58)

1 (1-1.3)

Normal weight (18.5-24.9 kg/m2)

11.5-16

25-35

0.42 (0.35-0.50)

1 (0.8-1)

Overweight (25.0-29.9 kg/m2)

7-11.5

15-25

0.28 (0.23-0.33)

0.6 (0.5-0.7)

Obese (≥ 30.0 kg/m2)

5-9

11-20

0.22 (0.17-0.27)

0.5 (0.4-0.6)

Source: Institute of Medicine (US) and National Research Council (US) Committee to Reexamine IOM Pregnancy Weight Guidelines; Rasmussen KM, Yaktine AL, editors. Weight Gain During Pregnancy: Re-examining the Guidelines. Washington D.C.: National Academies Press (US), 2009.