CDC ranges
Recommended weight gain, as CDC lists it:[1]
| BMI before pregnancy | One baby | Twins |
|---|---|---|
| Underweight (under 18.5) | 28 to 40 lb | Not listed here |
| Normal weight (18.5 to 24.9) | 25 to 35 lb | 37 to 54 lb |
| Overweight (25 to 29.9) | 15 to 25 lb | 31 to 50 lb |
| Obese (30 or more) | 11 to 20 lb | 25 to 42 lb |
For triplets or more, CDC says to ask your provider.[1]
ACOG says BMI does not account for body composition.[2] It says everyone has a right to respectful, high-quality health care delivered without judgment.[2]
How other sources put it
Sources differ
Eating and activity
ACOG says exercise in pregnancy can help with healthy weight gain.[4]
Questions families ask
How much weight should I gain in pregnancy?
CDC gives ranges by BMI before pregnancy, from 28 to 40 lb for underweight to 11 to 20 lb for obese, with one baby.[1]
How much weight is gained in the first trimester?
ACOG says only 1 to 5 pounds, or none, in the first 12 weeks.[2]
Free from UpOnly Learning. Written for families of every faith. No outside ads and no affiliate links. Every fact on this page comes from the sources listed below. How we source and review these pages
Updated 2026-10-24: first published.
Sources
All sources were opened and checked on the date shown.
- Centers for Disease Control and Prevention. Weight Gain During Pregnancy. Checked October 24, 2026.
- American College of Obstetricians and Gynecologists. Obesity and Pregnancy. Checked October 24, 2026.
- NHS (United Kingdom). 12 weeks pregnant guide. Checked October 24, 2026.
- American College of Obstetricians and Gynecologists. Exercise During Pregnancy. Checked October 24, 2026.