How Much Weight Should I Gain During Pregnancy?

The amount of weight you should gain during pregnancy is based on your prepregnancy body mass index (BMI) and how many children you're carrying. BMI estimates body fat based on height and weight. You can calculate your BMI as follows:

Once you know your BMI, you've got a starting point for pregnancy weight gain. Women with higher BMIs are advised to gain less; those with lower BMIs should put on more pounds with pregnancy.

Here is a summary of weight gain guidelines for a single baby based on your BMI:

• If your BMI is less than 18.5: Gain 28 to 40 pounds
• If your BMI is 18.5 to 24.9: Gain 25 to 35 pounds
• If your BMI is 25 to 29.9: Gain 15 to 25 pounds
• If your BMI is 30 or greater: Gain 11-20 pounds

Here is a summary of weight gain guidelines for twins:

• If your BMI is less than 18.5: Ask your doctor
• If your BMI is 18.5 to 24.9: Gain 37 to 54 pounds
• If your BMI is 25 to 29.9: Gain 31 to 50 pounds
• If your BMI is 30 or greater: Gain 25 to 42 pounds