Most pregnant women need to gain between 25 and 35 pounds over the course of their pregnancy, though your specific target depends on your pre-pregnancy weight. The good news is that healthy weight gain doesn’t require a dramatic diet overhaul. It comes down to eating consistently, choosing calorie-dense foods that also deliver nutrients, and understanding the pace your body needs at each stage.
How Much Weight You Should Gain
Weight gain targets are based on your BMI before pregnancy. The CDC breaks it down like this for a single baby:
- Underweight (BMI under 18.5): 28 to 40 pounds
- Normal weight (BMI 18.5 to 24.9): 25 to 35 pounds
- Overweight (BMI 25.0 to 29.9): 15 to 25 pounds
- Obese (BMI 30.0 to 39.9): 11 to 20 pounds
If you’re carrying twins, those numbers jump significantly. Women at a normal pre-pregnancy weight should aim for 37 to 54 pounds with twins, while overweight women should target 31 to 50 pounds and obese women 25 to 42 pounds.
Where the Weight Actually Goes
If gaining 25 to 35 pounds sounds like a lot, it helps to know that most of it isn’t body fat. The baby accounts for roughly 7 to 8 pounds at birth. The rest is spread across the placenta, amniotic fluid, increased blood volume, larger breasts, a bigger uterus, and some additional fat stores your body builds to fuel breastfeeding. Every component serves a purpose, which is why gaining too little carries real risks for your baby, including low birth weight and preterm delivery.
The Right Pace: Trimester by Trimester
Weight gain isn’t evenly spread across nine months. During the first trimester, most women gain only 1 to 4 pounds total, and some lose weight due to nausea. That’s normal. The real gains happen from week 14 onward, through the second and third trimesters.
If you started at a healthy weight or were underweight, aim for about 1 pound per week during the second and third trimesters. If you started overweight or obese, the target is closer to half a pound per week. Steady, consistent gain matters more than hitting an exact number on any given week. Some weeks you’ll gain more, some less. The overall trend is what counts.
How Many Extra Calories You Need
The old advice to “eat for two” overstates it. For most women at a normal starting weight, calorie needs look like this:
- First trimester: about 1,800 calories per day (no real increase needed)
- Second trimester: about 2,200 calories per day
- Third trimester: about 2,400 calories per day
That works out to roughly 300 extra calories a day once you’re past the first trimester. Three hundred calories is a glass of whole milk with a peanut butter banana sandwich, or a cup of yogurt with granola. It’s not a dramatic increase, but if you’re struggling to gain weight, those extra calories need to come from foods that pack a lot of nutrition and energy into small portions.
Best Foods for Healthy Weight Gain
The key strategy is choosing foods that are both calorie-dense and nutrient-rich. That means prioritizing healthy fats, protein, and complex carbohydrates over empty-calorie snacks. Some of the most effective options:
- Nuts and nut butters: A couple tablespoons of peanut or almond butter adds around 200 calories plus protein and healthy fat.
- Whole milk, yogurt, and cheese: Switching from skim to whole milk is one of the easiest calorie boosts you can make.
- Avocado and olive oil: Drizzle olive oil over vegetables, add avocado to sandwiches, or blend either into a smoothie.
- Eggs: Versatile, inexpensive, and packed with protein and fat.
- Starchy vegetables and whole grains: Sweet potatoes, oats, granola, and brown rice provide sustained energy.
- Dried fruit: Much more calorie-dense than fresh fruit, and easy to eat on the go.
- Protein foods: Beef, chicken, pork, beans, and lentils all support the 71 grams of protein recommended daily during pregnancy.
A few simple habits can make a big difference. Add cheese to scrambled eggs. Stir peanut butter into oatmeal. Snack on trail mix between meals. Mix powdered milk into soups, mashed potatoes, or smoothies for extra protein and calories without extra volume. When you don’t feel hungry enough for a full meal, a homemade protein smoothie with whole milk, banana, nut butter, and oats can deliver 400 or more calories in a few sips.
A Note on Meal Replacement Shakes
It’s tempting to reach for store-bought nutritional shakes or protein powders when you’re struggling to eat enough. Be cautious here. These products are classified as supplements, not food, and they aren’t evaluated by the FDA for safety. Many contain herbal blends or proprietary ingredients that are difficult to identify on the label and could be harmful during pregnancy. Homemade smoothies using real food ingredients are a safer way to get liquid calories when solid meals feel like too much.
Gaining Weight When Nausea Won’t Quit
Morning sickness, especially severe nausea, is one of the biggest barriers to gaining weight in early pregnancy. If keeping food down is a struggle, the priority shifts from nutrition quality to simply eating whatever you can tolerate. A few strategies that help:
Keep dry foods like crackers, toast, or plain cereal at your bedside and eat something before you even stand up in the morning. An empty stomach tends to make nausea worse, so try not to go more than an hour or two without eating or drinking something small. Cold foods are often easier to tolerate than hot ones, because they produce less smell. Think cold sandwiches, cheese and crackers, yogurt, or fruit.
Separate eating from drinking. Having fluids with a meal can increase nausea for some women. Try drinking 30 minutes before or after you eat instead. If plain water is hard to keep down, adding a splash of juice or cordial can help. Milky drinks like smoothies or warm milk are a good option because they deliver both calories and protein in liquid form.
Cook and eat in well-ventilated spaces, or better yet, have someone else handle the cooking when possible. Strong food smells are a common trigger. Ginger, whether as ginger tea, crystallized ginger, or ginger biscuits, helps reduce nausea for some women. Bland, simple foods like rice, plain pasta, jacket potatoes, and toast tend to be the easiest to keep down during the worst stretches.
Keep tolerable snacks in your bag, your car, and your desk at work. Hunger can strike suddenly during pregnancy, and having something available prevents you from reaching the point where nausea takes over. Even small amounts eaten consistently throughout the day add up. Five or six mini-meals of 300 calories each can be far easier to manage than three larger ones.
What If You’re Not Gaining Enough
If you’re consistently falling behind your weight gain target, a few adjustments can help. Eat more frequently rather than trying to eat larger portions. Add calorie-dense toppings and ingredients to foods you already enjoy. A tablespoon of olive oil adds about 120 calories to any dish. Whole-fat dairy products, an extra egg at breakfast, or a handful of nuts as an afternoon snack can close a calorie gap without making you feel stuffed.
Track your weight at home weekly, at the same time of day, to get a sense of your trend. Short-term fluctuations from water retention or a rough week of nausea are normal and don’t mean something is wrong. What matters is the trajectory over weeks and months. If your weight has been flat or dropping for two or more weeks in the second or third trimester, that’s worth bringing up at your next prenatal appointment so your care team can adjust your plan.