The Institute of Medicine publishes weight-gain ranges by pre-pregnancy BMI. Your OB personalizes them — this is background, not medical advice.
Underweight (BMI <18.5): 28–40 lbs. Healthy (18.5–24.9): 25–35 lbs.
Overweight (25–29.9): 15–25 lbs. Obese (30+): 11–20 lbs.
Weeks 1–13: ~1–4 lbs total. After week 13: ~1 lb/week for healthy BMI, less for higher BMI. Your OB tracks it against your specific chart.
For non-pregnancy healthy weight, use our calculator.
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