Your guide to second trimester nutrition

By Annemarie Aburrow RD

Welcome to the second trimester – home of the elusive pregnancy 'bloom'. You will hopefully start to leave behind the troubles of morning sickness, and gain some extra energy. The second trimester (spanning weeks 13 – 26) is all about the growth or your baby and your bump. Your baby grows from the size of a peach to the size of a 35 cm long baby by the end of the second trimester!

What should I be eating?

Eating a healthy balanced diet continues to be important during this trimester. Try to include the following in your diet:

What are my second trimester nutritional requirements?

There's still no increase in energy (calorie) requirements this trimester, so you don't need to eat extra calories! Eating a good variety of protein-rich foods twice a day will help you meet your increased protein needs. Folic acid requirements are slightly raised, so include green leafy veggies and starchy foods in your diet, and check the labels of your breakfast cereals to make sure they're fortified with added vitamins and minerals.

Throughout pregnancy, vitamin D supplements are required to ensure you meet your increased requirements. Vitamin A requirements are slightly raised; including a variety of fruits, vegetables and low fat dairy products will ensure you meet these (avoid liver and liver-containing products as they contain high levels of vitamin A, which can be toxic for your baby).

How much weight should I gain during the second trimester?

Despite there being no additional calorie needs, you will likely gain just over half of your pregnancy weight this trimester. During pregnancy, you become more efficient at absorbing the nutrients you need from your diet, meaning you can gain weight without the need to eat too much more. If you were a healthy weight (BMI 18.5 – 24.9) at the start of your pregnancy, you should put on around 1lb (½ kg) per week during this trimester (half of this if you're obese). A simple rule of thumb is to be guided by your hunger, but to choose healthy snacks and be wary of snacks high in sugar or fat.

Keeping active during pregnancy will help you keep your weight in check. If you don't exercise at the moment, try to include exercise in your daily routine, e.g. swimming, walk to work or special pregnancy classes. Start slowly, gradually increasing to a target of 30 minutes at least 5 days a week.

Do I still need to take supplements?

You don't need to take folic acid after week 12 if you'd prefer not to, but many women continue taking it in the form of pregnancy multivitamins or Healthy Start Vitamins. You do however, still need to take vitamin D supplements (10 micrograms per day) throughout your pregnancy. Even if you're pregnant during the summer months, you may not get enough vitamin D simply through the action of sunlight on skin and by eating foods containing vitamin D (e.g. oily fish, fortified breakfast cereals and eggs).

Vitamin D is found in pregnancy multi-vitamin supplements and Healthy Start Vitamins, or you may decide to take a single supplement containing vitamin D. Be sure to avoid all regular vitamins or cod liver oil supplements because they contain high levels of vitamin A which could be dangerous for your growing baby.

Which prenatal vitamins

If you already consume a healthy, well-balanced diet, all you need is the basic formula that contains the recommended 400mcg of folic acid and 10mcg of vitamin D. You can get it from Boots or Holland & Barrett. Also, it’s a great option if you’re on a budget!

For those of you who feel like you could use some additional help in the nutrition department, go for a more complete supplement such as UK’s bestselling prenatal formula Pregnacare Plus Omega-3. It contains a combination of 19 vitamins and minerals, including 400mcg of folic acid and 10mcg of vitamin D, plus fish oil capsules.

Another option is New Chapter Perfect Prenatal. It’s an organic, whole food supplement rich in high quality nutrients, including multivitamin complex and probiotic blend. Although quite expensive, the supplement is very highly rated on the other side of the Atlantic and you can buy it in the UK from Amazon or small online vitamin retailers.

Foods to limit / avoid throughout pregnancy

It's important to limit and avoid certain foods during pregnancy. These include liver and liver products (due to their potentially toxic levels of vitamin A), certain fish (swordfish, shark and marlin), paté, raw / undercooked meat, fish and eggs, unpasteurised cheeses and blue vein / mould-ripened cheeses. It's best to wash fruit, vegetables and salads well, to remove any harmful parasites and bacteria. You should limit your intake of oily fish to twice a week, caffeine to 200mg a day and limit alcohol to 1-2 units once-twice a week.

Coping with heartburn

Heartburn is a common gripe in pregnancy, affecting as many as 80% of pregnant women. The following tips may help to reduce your symptoms of heartburn:

Other second trimester niggles


Pregnant women are more susceptible to anaemia. Foods high in iron include red meat, oily fish, beans, lentils and fortified breakfast cereals.


Constipation is common in pregnancy, caused by the pregnancy hormone progesterone slowing down the passage of food through the bowels. Eating plenty of fibre, found in wholegrains (e.g. porridge, granary bread, pasta and basmati rice), fruit, vegetables and pulses can help. Drink plenty of fluids (8-10 cups a day). Exercise can also help reduce constipation.


Try not to use cravings as an excuse to over-eat or eat unhealthy foods. It's ok to allow yourself treats of the foods your crave every now and again.

More trips to the loo

It's important to continue drinking plenty even though you're making extra trips to the toilet. Drinking plenty will help prevent burning, itching and other bladder problems.

Bleeding gums

Tender, swollen gums is common pregnancy, due to the hormonal changes sending more blood to your gums. Pregnancy is a good time to re-evaluate how your diet affects your dental hygiene. Limiting sugary foods, particularly in between meals is important. Choosing diet or no-added-sugar drinks instead of sugary drinks will also help.

Swelling (oedema)

Drinking plenty of fluids helps flush out the excess fluid.

You might also like:

Your guide to first trimester nutrition

Your guide to third trimester nutrition

A guide to your nutritional requirements in pregnancy

The sunshine vitamin: Vitamin D in pregnancy

The role of folic acid in pregnancy and pre-conception

Healthy diet for vegan pregnancy

Healthy nutrition tips for the vegetarian mothers-to-be

Prenatal vitamins explained

Specific nutritional needs and tips, trimester-wise

Foods to avoid in pregnancy


Your New Pregnancy Bible

The experts' guide to pregnancy and early parenthood - by Dr Anne Deans


Your guide to second trimester nutrition

Your guide to third trimester nutrition

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Caffeine in pregnancy: How much is too much?

“Pass the sick bag”: Eating your way through Hyperemesis Gravidarum

The role of probiotics in breastfeeding

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Calcium during pregnancy – what you need to know

Your guide to first trimester nutrition

Trying to Conceive? Foods you should avoid

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