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Weight Gain

The following guidelines for safe weight gain during pregnancy are according to BMI.  To do a quick work out of your BMI click here.

To make life easy just use this BMI calculator by CDC below and pop in your height and weight in lbs and it will automatically work out your BMI and show you where is on the BMI chart.

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Recommendations for a Single Pregnancy

Total Recommended Weight Gain

The Institute of Medicine (IOM) guidelines for total weight gain during a full-term pregnancy recommend that:

  • Underweight women, who have a body mass index (BMI) below 18.5, should gain 28 to 40 lbs. (12.7 to 18.1 kilograms).
  • Normal-weight women, who have a BMI of 18.5 to 24.9, should gain 25 to 35 lbs. (11.3 to 15.9 kg).
  • Overweight women, who have a BMI of 25.0 to 29.9, should gain 15 to 25 lbs. (6.8 to 11.3 kg).
  • Obese women, who have a BMI of 30.0 and above, should gain 11 to 20 lbs. (5 to 9.1 kg).

Rate of Weight Gain

The IOM guidelines suggest that pregnant women gain between 1 and 4.5 lbs. (0.5 to 2 kg) total during their first trimester of pregnancy. The guidelines recommend that women who are underweight or have normal weight gain, on average should aim to increase by about 1 pound every week during their second and third trimesters of pregnancy, and that women who are overweight or obese aim to gain about half a pound (225 g) every week in their second and third trimesters of pregnancy.

Recommendations for a Twin Pregnancy

Total Recommended Weight Gain

The IOM guidelines for total pregnancy weight gain when a woman is having twins are as follows:
  • Underweight: 50 to 62 lbs. (22.7 kg to 28.1 kg)
  • Normal weight: 37 to 54 lbs. (16.8 to 24.5 kg)
  • Overweight: 31 to 50 lbs. (14.1 to 22.7 kg)
  • Obese: 25 to 42 lbs. (11.3 to 19.1 kg)

Rate of Weight Gain

In the 2nd and 3rd trimesters it is recommended to gain approximately 1.5lbs per week when pregnant with twins.

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