The last three months of pregnancy (roughly weeks 28 to 40) are when your baby grows the fastest — putting on weight, building bones, and storing iron for the months after birth. What you eat now directly supports that final push, and also helps you stay strong for labour. The good news: you don’t need anything fancy. Everyday Indian foods, eaten the right way, cover most of what you and your baby need.
Quick Answer
In your third trimester, focus on four things:
- Protein — dal, eggs, paneer, milk, chicken or fish — for your baby’s rapid growth.
- Iron — for healthy blood and to cover the blood you lose at delivery. Keep taking your prescribed iron tablets.
- Calcium — for your baby’s bones and to protect your own stores — from dairy, ragi and til, plus prescribed calcium.
- Fibre and fluids — to ease the constipation and piles that are common now.
Eat smaller, more frequent meals, drink plenty of water, and keep taking the supplements your doctor prescribed — food supports them, it does not replace them.
What Your Baby Needs Now
The third trimester is a growth sprint. Your baby may nearly triple in weight, lay down fat, and harden their bones — all of which raises your nutritional needs.
- Protein is the building block for your baby’s tissues and your growing uterus and blood volume. Include a protein source in every meal: a katori of dal, an egg, paneer, curd, milk, or chicken/fish if you eat them.
- Iron matters more than ever. Your blood volume is high, your baby is storing iron for their first months, and you will lose some blood at delivery. Iron-rich foods include green leafy vegetables, jaggery, dates, rajma and chana — but food alone usually isn’t enough, which is why iron tablets are prescribed.
- Calcium goes into your baby’s bones and teeth. If you don’t get enough, your body pulls it from your own bones. Milk, curd, paneer, ragi and til (sesame) are good sources, alongside any prescribed calcium.
Eating With a Big Bump
As your uterus grows, it crowds your stomach. Many women find they feel full after just a few bites, or get heartburn and reflux after meals. The fix is simple: eat smaller portions more often — say five or six small meals instead of three large ones.
A few things that help:
- Don’t lie down right after eating; stay upright for a while.
- Cut back on very oily, spicy or fried food, which makes reflux worse.
- Sip fluids between meals rather than gulping a lot with food.
This keeps your energy steady without overloading a stomach that simply has less room.
Constipation and Piles — Fibre and Fluids
Constipation is one of the most common late-pregnancy complaints, and it can lead to piles (haemorrhoids). The growing uterus presses on your bowel, pregnancy hormones slow digestion, and iron tablets can make it worse.
To stay regular:
- Eat plenty of fibre — whole fruits, vegetables, salads, whole grains, and dals.
- Drink enough water through the day.
- Stay gently active — a short walk after meals helps.
Important: do not stop your iron tablets on your own because they cause constipation. Iron is essential right now. Instead, tell your doctor — they can adjust the dose, change the type, or suggest something safe to ease it.
Healthy Weight Gain
Some weight gain in the third trimester is normal and expected. But aim for quality, not quantity. Loading up on sweets, mithai and fried snacks adds weight without much nutrition, and can raise your risk of excess weight gain and gestational diabetes (GDM) — high blood sugar in pregnancy.
Build meals around dals, vegetables, whole grains, dairy and protein, and treat sweets and fried foods as occasional, not daily. If you’ve been told you have GDM, follow the specific diet your doctor or dietician gave you.
Energy for Labour
Labour is hard physical work, and you’ll want stamina. Steady, complex-carbohydrate energy foods — whole grains, roti, rice, oats, fruit — fuel you better than sugar highs that crash. Eating regular small meals in these final weeks helps keep your energy reserves up so you’re not running on empty when labour begins.
Supplements Are Still Essential
Food is the foundation, but in the third trimester your needs for iron and calcium are usually too high to meet by diet alone. That’s why your doctor prescribes supplements — typically iron, calcium, and often others. Keep taking exactly what’s prescribed, for as long as advised. Don’t stop or change doses on your own.
A note on salt and swelling: some mild swelling in the feet and ankles is normal late in pregnancy. Go easy on excess salt and very salty packaged foods. But sudden or severe swelling — especially of the face or hands — along with a bad headache or changes in your vision can be signs of pre-eclampsia (high blood pressure in pregnancy). Other warning signs include pain just below the ribs (upper abdomen) and a noticeable drop in your baby’s movements. These need urgent medical attention, so call your doctor or go to your maternity hospital straight away.
The Indian Context
In many Indian families, there’s loving pressure to “eat for two” — extra ghee, daily laddoos, rich foods. A little ghee and the occasional laddoo are fine and traditional, but you genuinely don’t need to double your food. You need better food, not vastly more of it. Politely accepting smaller portions, and choosing nourishing home-cooked meals over heavy sweets, serves you and your baby far better than eating to keep relatives happy.
When to Ask Your Doctor
Reach out to your obstetrician if you:
- Have sudden or severe swelling, a persistent headache, or vision changes.
- Have been diagnosed with GDM, anaemia, or high blood pressure and need a tailored diet.
- Can barely eat because of reflux, vomiting or feeling too full.
- Are unsure whether you’re gaining the right amount of weight.
Frequently Asked Questions
Q: How much extra do I need to eat in the third trimester?
A: Less than most people assume — usually a modest increase, not “eating for two.” Focus on adding nutrient-dense foods like protein, dairy and fruit rather than large extra portions. Your doctor can guide you on healthy weight gain for your situation.
Q: My iron tablets are causing constipation. Can I stop them?
A: No — don’t stop on your own. Iron is essential in late pregnancy. Add more fibre and water, stay active, and tell your doctor, who can adjust the dose or type or suggest a safe remedy.
Q: I feel full after a few bites. Is that normal?
A: Yes. Your growing uterus leaves less room for your stomach. Switch to five or six small meals a day instead of three big ones, and stay upright after eating to reduce reflux.
Q: Are ghee and laddoos good in the last months?
A: In moderation, they’re fine and provide energy. The problem is overdoing sweets and fried foods daily, which adds weight without much nutrition and can raise GDM risk. Keep them occasional.
Q: Can a good diet replace my supplements?
A: No. Food supports your nutrition, but third-trimester needs for iron and calcium are usually too high to meet by diet alone. Keep taking your prescribed supplements as advised.
Want support through these final weeks? Our community of expecting parents and pediatric experts is here to help — join here.
This article is for general information and is not a substitute for personalised medical advice. Always consult your obstetrician about your own pregnancy.