Eating in the Third Trimester
By the time you reach the third trimester (weeks 28–40), your baby is growing rapidly — putting on weight, developing brain function, and preparing for life outside the womb. Your nutritional needs are at their highest point, yet a growing uterus pressing on your stomach can make large meals genuinely uncomfortable.
The solution? Smaller, more frequent meals that are dense in nutrients. This meal plan is designed around that principle: five to six smaller eating occasions spread through the day, each one packed with the nutrients your body and baby need most right now.
Third Trimester Nutrition Priorities
- Calcium & Vitamin D: Baby's bones are mineralising rapidly
- Iron: Blood volume is at its peak; your baby is also building iron stores for after birth
- DHA (Omega-3): Critical for final brain and eye development
- Protein: Supports continued fetal growth and your own tissue repair
- Fibre: Constipation is common in the third trimester — fibre and fluids help enormously
- Magnesium: Supports sleep, muscle relaxation, and may reduce leg cramps
Sample Third Trimester Meal Plan
Day 1
- Breakfast: Porridge made with full-fat milk, topped with sliced banana, a handful of walnuts, and a drizzle of honey
- Mid-morning snack: Greek yoghurt with mixed berries
- Lunch: Lentil and vegetable soup with a slice of wholegrain bread
- Afternoon snack: Sliced apple with almond butter
- Dinner: Baked salmon with roasted sweet potato and steamed broccoli
- Evening snack: Warm glass of milk and a small handful of almonds
Day 2
- Breakfast: Scrambled eggs on wholegrain toast with sliced avocado
- Mid-morning snack: A small handful of mixed seeds and dried apricots
- Lunch: Chicken and chickpea salad with leafy greens, cherry tomatoes, and olive oil dressing
- Afternoon snack: Wholegrain crackers with hummus
- Dinner: Beef stir-fry with pak choi, peppers, and brown rice
- Evening snack: Small bowl of fortified cereal with milk
Day 3
- Breakfast: Smoothie: full-fat milk or fortified oat milk, spinach, frozen mango, banana, and a spoonful of flaxseed
- Mid-morning snack: Boiled egg and a piece of fruit
- Lunch: Jacket potato with tuna (in spring water) and a side salad
- Afternoon snack: Cheese and wholegrain crackers
- Dinner: Lentil dhal with spinach, served with basmati rice and a small naan
- Evening snack: Natural yoghurt with a drizzle of honey
Hydration in the Third Trimester
Staying well-hydrated is especially important in the third trimester. Aim for around 8–10 glasses of water per day. Dehydration can trigger Braxton Hicks contractions and contribute to fatigue, constipation, and urinary tract infections — all of which are already more likely in late pregnancy.
Herbal teas such as peppermint (for digestive comfort) and raspberry leaf (discuss timing with your midwife) can contribute to fluid intake. Avoid high-caffeine drinks; keep caffeine under 200 mg per day.
Managing Heartburn and Fullness
As your uterus grows, heartburn and that "too full" feeling after even modest amounts of food become very common. A few strategies that help:
- Eat slowly and stop before you feel completely full
- Avoid lying down immediately after eating
- Skip very spicy, fatty, or fried foods if they trigger reflux
- Keep your evening meal lighter and earlier in the evening
Foods to Prioritise This Trimester
- Oily fish (salmon, sardines, mackerel) — 2 portions per week
- Dark leafy greens (spinach, kale, broccoli)
- Dairy or calcium-fortified plant alternatives
- Lean meats, eggs, lentils, and beans for protein and iron
- Colourful fruits and vegetables for vitamins and antioxidants
- Wholegrains for sustained energy and fibre
Final Word
You're in the home stretch. Nourishing yourself well in these final weeks supports your baby's last stages of development and helps prepare your body for the physical demands of labour and early postpartum recovery. Small, nourishing meals — and plenty of water — are your best tools right now.