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Nutrition

What to Eat During Pregnancy: A Trimester-by-Trimester Guide

Why Nutrition Matters During Pregnancy

What you eat during pregnancy directly affects your baby’s growth and development. A well-balanced diet provides the building blocks for your baby’s brain, bones, organs, and immune system while also supporting your own health through the physical demands of pregnancy. The good news is that eating well during pregnancy does not require a complicated plan — it is about making consistent, nutrient-rich choices.

Key Nutrients You Need

Folate (Folic Acid)

Folate is critical during the first trimester for preventing neural tube defects such as spina bifida. Aim for 600 micrograms daily from a combination of supplements and foods like leafy greens, fortified cereals, lentils, and citrus fruits. Most prenatal vitamins contain the recommended amount.

Iron

Your blood volume increases by nearly 50 percent during pregnancy, making iron essential for producing the extra red blood cells you and your baby need. Good sources include lean red meat, poultry, beans, spinach, and fortified grains. Pairing iron-rich foods with vitamin C (like orange juice or bell peppers) improves absorption.

Calcium

Your baby needs calcium to build strong bones and teeth, and if you do not consume enough, your body will draw from your own bone stores. Aim for 1,000 milligrams daily through dairy products, fortified plant milks, tofu, almonds, and leafy greens.

DHA (Omega-3 Fatty Acid)

DHA is vital for your baby’s brain and eye development, particularly during the third trimester when brain growth accelerates. Fatty fish like salmon and sardines are excellent sources. If you do not eat fish, consider an algae-based DHA supplement. Aim for 200 to 300 milligrams daily.

Vitamin D

Vitamin D works alongside calcium to support bone health. Spend time outdoors when possible and include vitamin D-rich foods like fortified milk, eggs, and fatty fish. Most prenatal vitamins contain 400 to 600 IU.

Foods to Avoid

Certain foods carry risks during pregnancy and should be avoided:

First Trimester: Building the Foundation

During the first trimester, calorie needs do not increase significantly. Focus on quality rather than quantity. Folate is the star nutrient right now, so prioritize folate-rich foods daily. If morning sickness makes eating difficult, eat whatever you can tolerate and stay hydrated. Crackers, toast, ginger tea, and small frequent meals can help you get through the worst of it. Your prenatal vitamin serves as a safety net for days when eating feels impossible.

Second Trimester: Growing Demands

By the second trimester, you need roughly 340 additional calories per day — about the equivalent of a yogurt and a handful of nuts. Appetite typically returns as nausea fades, making this a great time to establish healthy eating patterns. Iron needs increase significantly, so focus on iron-rich proteins and pair them with vitamin C sources. This is also when many women develop pregnancy cravings. It is fine to indulge occasionally, but try to balance treats with nutrient-dense meals.

Third Trimester: Final Stretch

In the third trimester, calorie needs increase by about 450 extra per day. Your baby is gaining weight rapidly and developing brain tissue, so DHA and protein become especially important. Calcium intake remains critical as bones continue to harden. Heartburn and reduced stomach capacity are common as your uterus expands, so continue eating smaller, more frequent meals.

Staying Hydrated

Water is essential for forming amniotic fluid, carrying nutrients to your baby, and supporting your increased blood volume. Aim for at least 8 to 12 glasses of water per day. If you are exercising or in warm weather, you may need more. Signs of dehydration include dark urine, dizziness, and headaches.

Use our pregnancy week tracker to see exactly how your baby is growing and what nutrients are most important each week.