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Weight Gain During Pregnancy, By Trimester

pregnant woman and man walking outdoors


Eating for two is about eating twice as healthy, not twice as much.  

To maintain a healthy weight throughout your pregnancy, plan your meals and choose healthier foods, like vegetables and fruit rich in colour and high in fibre.

A healthy weight gain during pregnancy is usually between five and 18 kilograms (11 to 40 pounds). For women carrying twins, weight gain is usually between 11 and 25 kilograms (25 to 54 pounds).

Your healthy pregnancy weight depends on your weight before you got pregnant. Women with a Body Mass Index (BMI) under 18.5 should gain more, while women with a BMI over 25 should gain less.

An active lifestyle is one of the keys to healthy weight gain during pregnancy. Check with your healthcare provider about the level of physical activity that’s right for you during pregnancy. Weight loss and dieting are not recommended while you’re pregnant.  Focus on healthy eating and healthy foods, not your weight. For more information about healthy weight gain during pregnancy, talk with your healthcare provider. You can also call HealthLink BC at 8‑1‑1 to speak with a registered dietitian.

1st Trimester

Weight gain should be minimal in the first trimester (0.5 to 2.0 kilograms or 1.1 to 4.4 pounds). If you lose or gain a significant amount of weight in the first trimester (more than five to 10 per cent of your pre-pregnancy weight), talk with your healthcare provider for support.


2nd Trimester

During the second trimester your healthy weight gain should be steady and gradual. Averaging around 0.2 to 0.5 kilograms (0.5-1.0 pound) per week. If you're gaining more, see the guidelines in Eating Well with Canada’s Food Guide and compare your eating habits.

3rd Trimester

Weight gain should remain steady and gradual during your third trimester. The average weight gain is around 0.2 to 0.5 kilograms (0.5-1.0 pound) per week. Check out Health Canada’s information about following the Food Guide during pregnancy and breastfeeding.


Resources & Links:

HealthLink BC: Nutrition and Weight Gain During Pregnancy
HealthLink BC: Healthy Eating for Pregnancy
Health Canada: Pregnancy Weight Gain Calculator


Last Updated: August 2, 2013