How to Maintain a Healthy Weight While Pregnant
We’ve all heard the common saying that a pregnant woman is “eating for two”, meaning she should eat more, but you may wonder how to maintain weight while pregnant if you’re upping your calories. Unfortunately, following that advice to a T can be more harmful than helpful. You do not need to double your meals to grow a healthy baby, and you may be surprised to learn that you don’t need extra calories at all during the first trimester (depending on guidance from your provider) and only roughly ~340 extra calories per day during the rest of your pregnancy.
Learning how to maintain a healthy weight while pregnant, including gaining the right amount at the right pace, is one of the healthiest choices you can make for both you and your baby. Your Women’s Health Connecticut provider can help you set a safe target range and guide your nutrition and exercise from your first prenatal visit through delivery.
Key Takeaways
- “Eating for two” is a myth — you don’t need extra calories during the first trimester and only about 340 more per day in the second — that’s roughly one small snack, not double meals, and consistently overeating raises the risk of gestational diabetes, preeclampsia, and high blood pressure.
- Healthy weight gain during pregnancy is set by your pre-pregnancy BMI — 25 to 35 pounds if you start at a normal weight, and 11 to 20 pounds if you start with obesity. These ranges help reduce certain risks like premature birth and difficult deliveries.
- Most weight gain happens after the first trimester — expect only about 1 to 4 pounds in the first 12 weeks — and mild early weight loss from nausea is common and usually harmless, so a slow start on the scale is normal.
- Pregnancy is not the time for intentional weight loss, even if you begin overweight — rather than dieting to lose weight while pregnant, focus on balanced nutrition and about 150 minutes of moderate exercise a week, guided by your provider.
- Women’s Health Connecticut checks your weight at every prenatal visit and offers its NURTURE app to track weight and blood pressure between visits — pairing provider oversight with self-monitoring helps you catch off-target trends early and adjust before problems develop.
- How much weight should you gain during pregnancy?
That’s not a cut-and-dried answer–everyone is different. How much weight you should gain during pregnancy depends primarily on your pre-pregnancy body mass index (BMI). For a woman who starts at a normal weight, the average weight gain during pregnancy falls between 25 and 35 pounds — but that range increases and decreases if you are underweight or overweight.
The table below shows the healthy weight gain during pregnancy when carrying one (1) baby. Our Women’s Health Connecticut providers use it as a guide:
| Weight Before Pregnancy | Body Mass Index (BMI) | Weight You Should Gain When Pregnant | Weight Gain Per Week – in the 2 & 3 Trimester |
| Underweight | BMI of less than 18.5 | 28-40 pounds | 1-1.3 pounds |
| Normal Weight | BMI 18.5-24.9 | 25-35 pounds | 0.8-1 pound |
| Overweight | BMI 25.0-29.9 | 15-25 pounds | 0.6 pound |
| Obese | BMI 30.0 or more | 11-20 pounds | 0.5 pound |
One quick note on gaining more than the above ranges: national data from the CDC show that nearly half of pregnant women gain more than the recommended amount. We see it fairly often, so if you’re worried, your Women’s Health Connecticut maternity team can help you manage your weight and support healthful, sustainable life changes. If you’re expecting twins or multiples, these ranges are higher, and your provider will set targets specific to your pregnancy.
How much weight do you gain in the first trimester?
Surprisingly, very little. Weight gain in the first trimester is typically just 1 to 4 pounds total across the first 12 weeks, even for women who go on to gain a full 25 to 35 pounds. Your baby is still tiny early on, so the real weight gain arrives in the second and third trimesters at a steadier weekly pace.
If the scale barely moves in your first trimester, that’s normal. And if it dips slightly, that’s usually normal too due to nausea or fatigue. Remember–you’re undergoing a lot of changes, so it’s normal for your diet to change in these first few months of pregnancy.
Is it normal to lose weight during pregnancy?
It’s common not to gain weight in the first trimester, and some women may even lose weight. Intentional weight loss is a different story. For most women, losing weight while pregnant through dieting or calorie restriction can deprive your baby of essential nutrients needed to grow. Any exception to that needs to be thoroughly discussed with your provider, not handled with a DIY diet.
Call your Women’s Health Connecticut provider if you’re steadily losing weight after the first trimester, can’t keep food or fluids down, or have lost more than a few pounds early on. Persistent vomiting can sometimes point to a treatable condition, and it’s always worth a conversation.
Why maintaining a healthy weight matters
Unfortunately, being overweight or obese can complicate your ability to become pregnant and may even hamper the effectiveness of some fertility treatments. Achieving and maintaining a healthy weight range before becoming pregnant is ideal; however, we realize that this isn’t always realistic or possible for everyone. If you begin your pregnancy with a body mass index (BMI) in the overweight or obese range, managing your weight gain during pregnancy can help you avoid certain complications.
Potential complications for mom
- High blood pressure
- Gestational diabetes
- Preeclampsia
- Problems with bleeding and infections during delivery
Potential complications for baby
- Premature birth
- Larger birth weight, which can complicate delivery
- Congenital disabilities
- Stillbirth
How to maintain a healthy weight while pregnant
Maintaining a healthy weight while pregnant comes down to a few sustainable habits rather than any strict regimen.
Eat well, not double
Aim to eat well in a way that’s filling and satisfying, not to double your regular meals. Your provider will recommend a balanced diet built around vegetables, fruits, whole grains, lean proteins, and dairy, while going easy on solid fats and added sugars. The goal is nutrient-dense food, not more food.
Add calories gradually — and only when your body needs them.
The widely cited guidance from the American College of Obstetricians and Gynecologists (ACOG) looks like this for most pregnancies:
- First trimester (weeks 1–12): No extra calories needed.
- Second trimester (weeks 13–24): About 340 extra calories per day.
- Third trimester (weeks 25–42): About 450 extra calories per day.
If you began pregnancy overweight, your provider may recommend fewer extra calories than the above, but you’ll still need a nourishing, full diet for your growing baby.
To put 340 calories in perspective, it’s about the size of one of these:
- 1 slice of whole wheat bread with ½ an avocado (~200 calories)
- 1 apple with 2 tablespoons of almond butter (~290 calories)
- 1 cup of chopped chicken (~335 calories)
Stay active
Most pregnant women should aim for about 150 minutes of moderate-intensity exercise each week — for example, brisk walking or water aerobics. Regular movement supports steady, healthy weight gain, and some studies have even shown a correlation between exercise and positive labor and delivery outcomes. Just be sure to confirm any exercise plan with your provider first.
Stay hydrated and keep meals regular
Small, frequent meals often sit better than large ones, especially in the third trimester when a growing uterus can take up a lot of space and overeating feels uncomfortable. And don’t skimp on the water–pregnant women need about 8 to 12 cups of fluids daily. That’s about 64 to 96 ounces, or 1.9 to 2.8 liters.
Monitoring your weight during pregnancy
No matter your BMI at the onset of your pregnancy, your Women’s Health Connecticut maternity team will help you monitor and manage your weight to minimize potential risks. At each prenatal visit, we’ll check your weight to help track your baby’s growth. If your provider notices anything abnormal or potentially dangerous, they will advise you on lifestyle changes and suggest helpful resources.
To stay on top of it between visits, download NURTURE, Women’s Health Connecticut’s signature pregnancy app. Built-in weight and blood pressure trackers help you track your progress and understand the changes your body goes through week to week.
If you have a history of disordered eating
If you’ve experienced disordered eating, we understand that closely tracking calories and stepping on a scale can feel triggering. Please share this with your Women’s Health Connecticut maternity team. Your provider can connect you with emotional support resources and help you build a healthy, sustainable relationship with your weight during pregnancy and beyond. You never have to navigate this part alone.
Frequently Asked Questions About Weight Gain During Pregnancy
How much weight gain during pregnancy is normal?
For a woman starting at a normal BMI, normal weight gain during pregnancy is about 25 to 35 pounds. The range is higher if you start underweight (28–40 pounds) and lower if you start overweight (15–25 pounds) or with obesity (11–20 pounds).
How much weight do you gain in the first trimester?
Usually only about 1 to 4 pounds. The bulk of pregnancy weight gain happens in the second and third trimesters.
Is it normal to lose weight during pregnancy?
Mild weight loss in the first trimester from nausea and reduced appetite is common and usually harmless. Ongoing weight loss later in pregnancy should be discussed with your provider.
Can you lose weight while pregnant?
Intentional weight loss is generally not recommended during pregnancy, even for women who start overweight. A safer goal is managing how much weight you gain, guided by your provider—not dieting to lose it.
What’s the best way to maintain a healthy weight while pregnant?
Eat balanced, nutrient-dense meals, add calories only as your body needs them, aim for about 150 minutes of moderate exercise weekly, and let your provider help you set and track a target range.
The Bottom Line: Maintaining a Healthy Weight During Pregnancy is Critical
While gaining weight is a normal and expected part of a healthy pregnancy, gaining too much or trying to lose weight while pregnant can pose risks to both mom and baby. Your Women’s Health Connecticut provider can help you determine a safe weight range and advise you on nutrition and exercise throughout your pregnancy.
If you’re gaining weight too quickly or losing weight, request an appointment with your Women’s Health Connecticut Provider so we can connect you with guidance, resources, and support.