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IOM guidelines by pre-pregnancy BMI: underweight (<18.5): 28–40 lb total; normal (18.5–24.9): 25–35 lb; overweight (25–29.9): 15–25 lb; obese (≥30): 11–20 lb. Gain is minimal in the first trimester (1–4 lb), then about 1 lb/week in the second and third. Weight gain supports placenta, blood volume, amniotic fluid, and baby growth. Excessive or insufficient gain increases complications.
Normal weight
Total gain guide: 25–35 lb