Nutrition and Exercise During a Twin Pregnancy

Your body is doing something extraordinary. Here’s how to support it — and your babies — with the right food and movement at every stage.

By Shelby Gallagher | Medically reviewed by Marci Fults, DO (March 2026) | Updated September 2026

Pregnancy changes your body in ways that are sometimes gradual, sometimes startling. When you’re carrying twins, those changes are amplified — and so are the demands on your nutrition and energy.

Staying active and eating well during a twin pregnancy is not only possible, it’s one of the most meaningful investments you can make for yourself and your babies.

Generic prenatal advice doesn’t always account for the specific demands of a twin pregnancy. What follows is practical guidance on both exercise and nutrition, grounded in what carrying two babies actually requires.

Is Exercise Safe During a Twin Pregnancy?

Yes — for most women carrying twins, exercise is safe and recommended throughout pregnancy. Common concerns about miscarriage, low birth weight, or early delivery from physical activity are not supported by evidence. Regular exercise can reduce back pain, ease constipation, support healthy weight gain, and lower the risk of gestational diabetes and preeclampsia.

As always, consult your ob-gyn before starting or continuing any exercise routine. Certain conditions require avoiding physical activity, including placenta previa after 26 weeks, preterm labor or ruptured membranes, preeclampsia, severe anemia, and specific heart or lung conditions. Stop exercising and contact your provider immediately if you feel dizzy, notice any bleeding, or experience chest or calf pain or swelling.

One important thing to know: Twin pregnancies often require some adjustment to exercise as pregnancy progresses, but there isn’t a universal week when you need to cut back. Low-impact activities such as walking, swimming and prenatal yoga may remain appropriate later in pregnancy. Talk with your ob-gyn or maternal-fetal medicine specialist about what level of activity is appropriate for your particular pregnancy.

What Kinds of Exercise Work Best

The most effective workouts during a twin pregnancy are low-impact and support the pelvic floor — which takes on considerable strain when you’re carrying two.

Walking is the easiest place to start. A brisk walk or gentle hike builds cardiovascular fitness without stressing joints or creating fall risk. It’s easy to scale up or down as your energy fluctuates week to week.

Yoga and Pilates (modified for pregnancy) are excellent for flexibility, stress reduction, and breath control. Both emphasize pelvic floor engagement. As your belly grows and your center of gravity shifts, use modified movements and avoid any pose that requires significant balance.

Swimming is often the most comfortable option later in a twin pregnancy. The buoyancy supports the extra weight you’re carrying and provides a full-body workout with minimal injury risk.

If you were highly active before pregnancy, you can generally continue your usual routine with your ob-gyn’s approval — adjusting as your pregnancy progresses. Postpartum exercise matters too: it improves mood and reduces the risk of deep vein thrombosis (DVT) in recovery.

The goal isn’t maintaining your pre-pregnancy fitness. The goal is staying strong enough to carry two babies and recover well.

How Many Calories Do You Need When Pregnant With Twins?

Women carrying twins need approximately 600 additional calories per day above their normal intake — but the quality of those calories matters as much as the quantity.

The goal is a well-balanced diet that supports appropriate weight gain during pregnancy and the growth of two babies. Twin pregnancies also place significantly higher demands on protein and carbohydrate intake — Sunnybrook Health Sciences Centre recommends an extra 50 grams of protein daily above singleton pregnancy requirements, and a minimum of 208 grams of carbohydrates per day to support fetal development and prevent ketosis. You can estimate your specific protein needs using the Sunnybrook Twins Research Centre protein calculator or ours below.

Prenatal vitamins cover most micronutrient needs; a few deserve specific attention:

Folic acid is one of the few nutrients that’s difficult to get through food alone. Take it as a daily supplement — it significantly reduces the risk of neural tube defects.

Iron supports the extra blood production that you and your twins both require, and helps prevent fatigue and premature birth risk.

Calcium and Vitamin D build your babies’ bones and teeth, and support your own bone health during a pregnancy that makes significant demands on your stores.

Choline and Omega-3 fatty acids support fetal brain development. Omega-3s are associated with reduced preterm birth risk — particularly relevant in twin pregnancies.

B Vitamins sustain your energy and support the cellular development of your babies.

One caution: not all supplements are FDA-approved, and some can interact with medications or cause harm in excess. Discuss any supplement beyond your prenatal vitamin with your provider.

Why weight-gain targets are individualized

Weight-gain targets for twin pregnancies are set person by person because both gaining too little and gaining too much have been linked to more complications, and the right range depends on each woman’s starting weight and each pregnancy. Two recent studies show why.

In a prospective study of 1,029 women with twin pregnancies at a single hospital in Qingdao, China, women whose weight gain fell below the study’s adequate range had higher odds of preterm birth (odds ratio 2.13; 95% CI 1.55–2.94), low birth weight (2.01; 1.33–3.05), and a small-for-gestational-age baby (1.62; 1.03–2.54) than women whose gain was in the adequate range. The study defined “adequate” as the middle half of weight gains among the women studied, within each BMI category. When it used U.S. Institute of Medicine categories instead, the preterm birth and low birth weight associations held, but the small-for-gestational-age association was no longer statistically significant. In the same study, gaining more than the adequate range was linked to lower odds of low birth weight and small-for-gestational-age babies (Zhao et al., BMC Pregnancy and Childbirth, 2025).

Read these numbers carefully. The study was observational and drew on one hospital, and its classifications and exclusions limit how far the results apply to other women. Shorter pregnancies also leave less time to gain weight, so a short pregnancy and low total gain are partly tangled together.

Odds ratios are not risk ratios: when an outcome is as common as preterm birth is in twin pregnancies, an odds ratio of 2 does not mean the risk doubled.

The study’s own adequate range was also lower than the Institute of Medicine’s recommended range, which is another reason not to treat one study’s figures as a personal target.

Gaining more is not automatically safer. In a retrospective study of 919 women and 1,838 babies from twin pregnancies that reached at least 28 weeks, at a hospital in Hunan, China, excessive weight gain was associated with higher adjusted odds of hypertensive disorders of pregnancy (2.60; 95% CI 1.78–3.78) and of a large-for-gestational-age baby (1.77; 1.24–2.51). Inadequate gain was again associated with a small-for-gestational-age baby (2.10; 1.43–3.09) (Zhu et al., Frontiers in Reproductive Health, 2026).

This study was also observational, and it only included pregnancies that reached at least 28 weeks. Fluid retention linked to hypertensive disorders can itself add weight, so in some women the weight gain may be partly a result of the condition rather than its cause.

What this means in practice: these studies are one reason your provider tracks your weight gain against a target set for your pre-pregnancy BMI and your pregnancy, rather than one number for everyone, and why the weight-gain figure in the calculator below is an estimate. They do not show that weight gain alone determines how a twin pregnancy goes, and neither study is a basis for setting your own target. If you are concerned that you are gaining too little or too much, raise it with your ob-gyn or midwife.

Frequently Asked Questions