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Your weight-gain range (by pre-pregnancy BMI)

What it is

BMI under 18.5: 12.5–18 kg; 18.5–25: 11.5–16; 25–30: 7–11.5; over 30: 5–9; twins 17–25. ~0.3–0.5 kg a week from T2. Outside the band: mention it at the next visit.

Sources

• Weight gain during pregnancy: reexamining the guidelines (2009) — Institute of Medicine / NRC · checked 02-09-2026

Last reviewed 01-09-2026 · Confidence: high

Compiled with AI assistance from the public sources listed above. Not yet reviewed by a clinician — check anything important against the source, with Tipat Halav or with your doctor.