Pregnancy Nutrition: The Best Foods to Eat in Each Trimester

What you eat during pregnancy fuels not just your body, but your baby’s entire development. That doesn’t mean eating for two — the calorie increase needed is actually quite modest. But the quality of what you eat matters enormously. Here’s a trimester-by-trimester guide to pregnancy nutrition.

Key Nutrients Throughout Pregnancy

Regardless of trimester, certain nutrients are essential throughout all 40 weeks:

• Folic acid (400–600mcg): Neural tube development, especially critical in weeks 1–12
• Iron (27mg/day): Supports your increased blood volume and baby’s iron stores
• Calcium (1000mg/day): Bone and teeth development — dairy, fortified plant milks, leafy greens
• Vitamin D (10–15mcg/day): Most pregnant women need to supplement, especially in winter
• Omega-3 fatty acids (DHA): Brain and eye development — oily fish (low-mercury), walnuts, flaxseed
• Protein: Cell growth and repair — aim for 70–100g per day

First Trimester (Weeks 1–12)

If nausea is dominating, your goal isn’t perfection — it’s eating whatever stays down. Focus on:

• Bland, starchy foods to manage nausea: crackers, toast, plain rice, plain pasta
• Ginger in any form — tea, biscuits, capsules — has evidence for reducing nausea
• Iron-rich foods: lean red meat, lentils, beans, fortified cereals, tofu
• Folate-rich foods: dark leafy greens, asparagus, avocado, citrus fruits, chickpeas
• Small, frequent meals rather than large ones — empty stomach worsens nausea

Second Trimester (Weeks 13–26)

For most women, nausea eases and appetite returns — often with a vengeance. This is a great time to really focus on nutritious eating. Your baby’s bones, brain, and organs are developing rapidly.

• Calcium: Dairy (milk, yoghurt, cheese), sardines with bones, broccoli, almonds
• Protein: Eggs, chicken, fish (low mercury — salmon, sardines, trout), pulses
• Healthy fats: Avocado, nuts, olive oil, oily fish
• Colourful vegetables: Aim for a rainbow — each colour provides different micronutrients
• Fibre: Constipation is common in the second trimester — oats, wholegrains, fruits, and vegetables help

Third Trimester (Weeks 27–40)

Your baby is growing rapidly and your stomach is increasingly compressed, making large meals uncomfortable. Your iron needs peak in the third trimester.

• Iron-rich meals with vitamin C (which enhances iron absorption): lentil soup with a squeeze of lemon, spinach salad with orange segments
• Smaller, more frequent meals to manage heartburn and fullness
• Magnesium-rich foods for leg cramps: pumpkin seeds, dark chocolate, leafy greens, beans
• Hydration: Aim for 2–3 litres of water daily. Dehydration increases Braxton Hicks contractions.
• Vitamin K (for blood clotting): broccoli, kale, spinach, vegetable oils

Supplements to Consider

A pregnancy-specific multivitamin covers most bases. Look for one containing folic acid, vitamin D, iron, iodine, and DHA. If you’re vegetarian or vegan, also supplement with B12, zinc, and consider a separate omega-3 algae oil (DHA from algae rather than fish).

Foods to Avoid During Pregnancy

• Raw or undercooked meat, fish, and eggs
• Liver and liver products (too much vitamin A)
• High-mercury fish: shark, swordfish, marlin, king mackerel
• Unpasteurised dairy and soft mould-ripened cheeses (Brie, Camembert)
• Raw shellfish
• Alcohol — no safe level has been established
• Excess caffeine — limit to 200mg/day (about one cup of coffee)

Good pregnancy nutrition doesn’t mean perfection. It means doing your best with the tools you have. Even in the hardest weeks of nausea or exhaustion, your body is remarkably good at prioritising your baby’s needs.