By Natalie Gingerich Mackenzie
Weight gain may be the most obvious (and, for some, dreaded) aspect of pregnancy. But pregnancy weight gain isn’t the same thing as “getting fat,” and shouldn’t be labeled that way. To be healthy during pregnancy, you need to put on pounds. In fact, your body’s change in size and shape is an essential part of the complex process that allows you to grow a human being and carry it around inside you for 9 months.
The changes begin nearly as soon as your pregnancy hormones reveal those two little lines when you pee on the stick. Your breasts may start to swell and grow. Hormonal changes loosen your ligaments (tissue that connects bones or cartilage together), expanding the rib cage and making room for your uterus to transform from the size of an orange to the size of a watermelon. Eventually, your hips widen and your center of gravity shifts to balance your growing belly.
The bundle of joy you take home at the end, weighing around 6 to 8 pounds, is just one piece of your pregnancy weight gain puzzle. The 30 pounds of average weight gain consist of baby’s pounds, plus:
So how do you know what’s the right amount of weight gain for you, and what’s too much or too little? The amount you need to gain is closely linked with your own pre-pregnancy weight. If you’re at a healthy weight when you get pregnant, your sweet spot is about 25 to 35 pounds. If you’re overweight, you’ll aim to gain less. Underweight or carrying multiples? You’ll try to gain more.
Not sure where you fall? Ask your doctor or midwife. And don’t assume no news is good news: Weight can be a difficult subject to discuss, but that doesn’t mean your provider doesn’t think it’s important. A study of doctors and midwives in the Journal of Women’s Health found that many were hesitant to bring up pregnancy weight gain for reasons as simple as being self-conscious about their own weight or not wanting to offend or worry their patients.
Along with tracking your weight changes, your provider will monitor your baby’s growth throughout pregnancy to make sure things are on track. This chart is based on information from the US Office of Women’s Health, the same information the I’m Expecting app uses to calculate whether your weight is on track.
Your pre-pregnancy weight |
Total you should aim to gain |
First trimester total weight gain |
Second and third trimester weight gain per week |
Underweight (BMI less than 18.5) |
28-40 pounds |
2.2-6.6 pounds |
1.0-1.3 pounds |
Healthy weight (BMI 18.5 to 24.9) |
25-35 pounds |
2.2-6.6 pounds |
0.8-1.1 pounds |
Overweight (BMI 25-29.9) |
15-25 pounds |
2.2-6.6 pounds |
0.5-0.7 pounds |
Obese (BMI over 30) |
11-20 pounds |
0.5-4.4 pounds |
0.4-0.6 pounds |
Putting on too much or too little can have negative effects for you and your baby. Here’s how:
Gaining too much can:
Tracking your weight using the I’m Expecting app (for iOS and Android) goes a long way when it comes to helping you achieve a healthy weight during pregnancy. For three tips for staying on track, click here.
Published on November 10, 2015.
Natalie Gingerich Mackenzie is a health and fitness writer and editor, as well as a certified personal trainer through the American Council on Exercise. She regularly contributes to national magazines including Fitness, Shape and SELF, and is the author of Tone Every Inch.
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