Pregnancy Nutrition by Trimester
A practical framework for how much to eat, which nutrients to prioritize, and what to skip — tailored to how your body’s needs change across each trimester.
Key Principles (All Trimesters)
- Whole-food first: think produce, legumes, whole grains, dairy/fortified alternatives, eggs, fish, lean meats, nuts, seeds.
- Protein anchor at meals/snacks (aim ~60–100g/day overall; your provider may adjust).
- Fiber + fluids to prevent constipation; hydrate to thirst (aim ~8–10 cups/day).
- Prenatal vitamin to backfill gaps (folate/folic acid, iron, iodine, vitamin D, etc.).
- Food safety: avoid high-mercury fish, unpasteurized products, undercooked meats/eggs, and unheated deli meats.
Calorie Guidance by Trimester
Typical additions for a singleton pregnancy (average-sized adult):
| Trimester | Extra Calories/Day | Notes |
|---|---|---|
| First (0–13 weeks) | ~0 | Focus on nausea-friendly foods and prenatal vitamin. |
| Second (14–27 weeks) | ~+340 | Add a protein snack and fruit/veg mini-meal. |
| Third (28–40 weeks) | ~+450 | Small, frequent meals; manage heartburn with gentler choices. |
Trimester Targets & Ideas
First Trimester (Weeks 0–13)
- Focus: folate/folic acid, vitamin B6 (nausea support), hydration.
- Easy wins: fortified cereals, eggs, citrus/berries, Greek yogurt, bananas, ginger tea.
- Nausea plan: dry crackers on waking, small frequent snacks, protein sips (milk/yogurt), cold foods if smells trigger nausea.
Second Trimester (Weeks 14–27)
- Focus: iron, calcium, vitamin D, choline, DHA, fiber.
- Easy wins: salmon or sardines 2x/week, leafy greens + beans, fortified dairy/alt, eggs, whole grains, fruit + nut butter.
- Snack ideas: trail mix, cottage cheese with fruit, hummus + veggies, avocado toast with egg.
Third Trimester (Weeks 28–40)
- Focus: protein at each meal, magnesium/potassium foods for cramps, manage heartburn.
- Easy wins: smoothies, oatmeal with seeds, yogurt parfaits, baked fish, lentil soups, kiwi/berries for fiber + vitamin C.
- Heartburn tips: smaller meals, avoid lying down after eating, choose milder seasonings, limit greasy/spicy/acidic foods if symptomatic.
Micronutrients that Matter
| Nutrient | Why | Foods |
|---|---|---|
| Folate / Folic Acid | Neural tube development | Leafy greens, legumes, fortified grains |
| Iron | Prevent anemia; support growth | Lean meats, beans, lentils, fortified cereals (pair with vitamin C) |
| Calcium + Vitamin D | Bone/mineral development | Dairy/fortified alt, small fish with bones, eggs, sunlight/vitamin D foods |
| Choline | Brain and neural development | Eggs, lean meats, soy, legumes |
| Iodine | Thyroid and brain development | Iodized salt, dairy, seafood |
| DHA (Omega-3) | Brain and eye development | Salmon, sardines, trout; algae-based supplements if vegetarian |
Food Safety Quick List
- Avoid high-mercury fish (shark, swordfish, king mackerel, tilefish).
- Choose pasteurized dairy and juices; avoid unpasteurized soft cheeses.
- Cook meats/eggs thoroughly; heat deli meats until steaming.
- Wash produce well; mind fridge temps and expiration dates.
Vegetarian or Vegan?
Pay special attention to B12, iron, iodine, calcium, vitamin D, and DHA (consider algae-sourced). Protein can be met with tofu/tempeh, legumes, lentils, soy yogurt, dairy/fortified alt, quinoa, nuts, and seeds.
Connect Your Plan
- Get a personalized weight range and weekly pacing with the Pregnancy Weight Gain Calculator.
- Learn how BMI informs your range in Understanding BMI in Pregnancy.
- See targets by BMI in How Much Weight to Gain During Pregnancy.
This guide is informational and not a substitute for medical advice. Your provider may tailor recommendations for your health history, activity level, or multiples.