Table 1.

1990 Institute of Medicine Guidelines

Prepregnancy BMI	Total weight gain (kg)	Rate weight gain 2nd/3rd trimester
Low BMI (<19.8)	12.5–18 (28–40 lbs)	0.5 (∼1 lb/week)
Normal BMI (19.8–26)	11.5–16 (25–35 lbs)	0.4 (1 lb/week)
Overweight BMI (>26–29)	7–11.5 (15–25 lbs)	0.3 (0.66 lb/week)
Obese BMI (≥29)	≥6.8 (≥15 lbs)	Not specified

BMI, body mass index