Questions about weight in pregnancy
Here we’ll answer some of the common questions about your weight in pregnancy, how much you should be eating and why this is important.
Why is my weight important to my pregnancy?
Being outside the ‘healthy weight’ range of the BMI scale before you get pregnant can increase the risk of pregnancy problems for you and your baby.
For example, having a BMI over 30 can increase the risk of complications, such as:
Being underweight can increase the risk of complications such as:
- miscarriage
- premature birth
- having an underweight baby.
This can be difficult to read but try not to worry. If you have an overweight or underweight BMI your midwife and doctor will give you extra care throughout your pregnancy. There are also lots of things you can do to minimise the risks, such as staying active and eating well.
How much extra should I eat in pregnancy?
You don’t need to eat any extra food during the first 6 months of pregnancy. After that, you only need an extra 200 calories a day. This is about half a sandwich. Find out more about fun and healthy 200 calorie snacks.
The most important thing is to make sure you eat a healthy, balanced diet, which will help make sure you and your baby have all the nutrients you need.
There’s no need to eat for two or drink full-fat milk. Try not to let well-meaning family and friends persuade you to have any extra helpings and try to keep foods that are high in sugar or fat, such as sweets, crisps and biscuits, as occasional treats.
Everyone is different. Find out what you can do if you are underweight and need to gain weight.
What exactly is a 'portion'?
It's not just what you eat that's important, it's how much you have of it. A portion is the amount of any one type of food you eat. For example, a fruit portion would be one apple or two plums. A vegetable portion would be a small side salad. Three heaped tablespoonfuls of cooked vegetables also count as a portion. Find out more about portion size.
Is it safe to diet during pregnancy?
Don't try to lose weight while you're pregnant as this is not healthy for you or your baby. You and your baby may miss out on nutrients that you need to stay healthy and strong.
If you are concerned about putting on weight, remember that you will lose a lot of it with the birth of your baby and the placenta. And, if you have a healthy diet in pregnancy this may make it easier to lose weight after you have the baby.
Try not to worry about putting on weight. Instead, focus on being as healthy as you possibly can and aim to have a balance of different foods from the Eatwell plate. This will help keep you healthy and prevent too much weight gain.
Talk to your doctor or midwife if you have an obese BMI. You should be referred to a dietitian or ask what weight-management programmes are available for pregnant women in your area.
It's also important to stay active during your pregnancy. This will boost your and your baby’s health, as well as helping with managing your weight.
Read more about how much weight you should gain during pregnancy
NICE Guidelines (2010) Weight management before, during and after pregnancy National Institute for Health and Care Excellence https://www.nice.org.uk/guidance/ph27
Royal College of Obstetricians and Gynaecologists Why your weight matters during pregnancy and after birth (Page last reviewed: Nov 2011) www.rcog.org.uk/globalassets/documents/patients/patient-information-leaflets/pregnancy/pi-why-your-weight-matters-during-pregnancy-and-after-birth.pdf
Clinical Knowledge Summaries (Aug 2017) Pre-conception advice and management https://cks.nice.org.uk/pre-conception-advice-and-management
Read more about weight management in pregnancy
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Making a weight management plan
It's important to look after yourself and start managing your weight as early as possible in your pregnancy to get the most benefit. Here’s some tips to help. -
Overweight and pregnant
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Weight management in pregnancy
Although you'll be putting on weight as your baby grows, limiting the amount of extra weight gain in pregnancy will improve your health and your baby's. -
Pregnant after weight-loss surgery
If you’ve had weight-loss surgery, it’s best to wait for at least 12 to 18 months after surgery and once your weight has stabilised to get pregnant.
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4 tips for managing your weight in pregnancy
There is support available to help you manage your weight during your pregnancy and after your baby is born. Read some tips for managing your weight. -
Underweight during pregnancy
If your BMI is underweight, you should get advice on how to increase and vary your diet in pregnancy. Read some common questions about having a low BMI. -
Healthy eating tips
The most important thing is to make sure you eat a healthy, balanced diet, which will help make sure you and your baby have all the nutrients you need. -
Weight management FAQs
Everyone puts on weight in pregnancy, but limiting the amount of extra weight you gain will improve your health and your baby's, both now and in the future.