Weight Category Before Pregnancy
Total Weight Gain
Less than 18.5
28–40 lb (12.5–18 kg)
25–35 lb (11.5–16 kg)
15–25 lb (7.0–11.5 kg)
Obese (includes severely obese)
30.0 or higher
11–20 lb (5–9 kg)
BMI = body mass index, which is weight in kilograms divided by height in meters squared; kg = kilogram.
Adapted from Institute of Medicine: Report Brief: Weight Gain During Pregnancy: Reexamining the Guidelines. 2009. Accessed 5/3/21.