Published by Bupa's Health Information Team, December 2011.

This factsheet is for women who have gestational diabetes (when diabetes develops in pregnancy), or for anyone who would like information about it. It doesn't provide information for women who already have diabetes and are pregnant or would like to become pregnant.

Gestational diabetes is high blood sugar (glucose) that develops in some women when they are pregnant. It can lead to problems for mothers and their babies if the diabetes is left uncontrolled.

About diabetes in pregnancy
Symptoms of gestational diabetes
Complications of gestational diabetes
Causes of gestational diabetes
Diagnosis of gestational diabetes
Treatment of gestational diabetes
After your baby is born
Prevention of type 2 diabetes


About gestational diabetes

Gestational diabetes means you have a high blood sugar level, but only during pregnancy. When you aren't pregnant you don't have diabetes.

Normally, your body releases a hormone (a chemical messenger carried in your blood) called insulin to make sure that sugar in your blood is taken up by your cells to turn into energy. Any excess sugar that isn't needed is stored in your cells as fat. Usually during pregnancy your hormones, such as oestrogens and progestogens, cause an increase in insulin resistance. This means that your body needs to produce more insulin to have the same effect on blood sugar as it would have when you aren't pregnant. This happens so that more sugar remains in your blood to be made available for your baby to use for energy and growth.

To cope with the increase in sugar, your body should normally produce more insulin in pregnancy. This ensures that any blood sugar not used by you, or taken up by your growing baby, is still stored. If you develop diabetes in pregnancy, it means that either your body isn't releasing enough insulin, or your cells aren't responding to it. The result is that your blood sugar level remains high. This can have a number of effects on you and your growing baby.

Gestational diabetes usually begins between weeks 13 to 28 of pregnancy and will go away after your baby is born. If you still have diabetes after the birth of your baby, it's likely that you already had underlying diabetes, but it was only picked up because you were pregnant. In this situation you will need to have treatment.


Symptoms of gestational diabetes

Often you won't have any symptoms of gestational diabetes. However, sometimes you might notice symptoms of having a high blood sugar level, which can include:

  • feeling thirsty more often than usual
  • needing to urinate more often and passing larger amounts of urine than usual
  • feeling tired

These symptoms are often associated with being pregnant.

These symptoms aren't always caused by gestational diabetes, but if you have them, see your family doctor or obstetrician (a doctor who specialises in pregnancy and childbirth).

Complications of gestational diabetes

Gestational diabetes can lead to a number of complications if it isn't controlled. You may be able to reduce your risk of many of these happening to you or your baby by carefully controlling your blood sugar level.

Complications affecting you
Complications that can happen to you include:

  • pre-eclampsia – high blood pressure during pregnancy that can lead to serious problems for you and your baby
  • too much amniotic fluid (the fluid around your baby in your womb)
  • premature labour – giving birth before 37 weeks of pregnancy
  • problems during the birth that could lead to you needing a caesarean

You're also more likely to develop gestational diabetes in future pregnancies and are at a higher risk of developing type 2 diabetes later in life. You will need to be checked for type 2 diabetes regularly so that treatment can be started if needed.

Complications affecting your baby
Having a high blood sugar level during pregnancy can lead to your baby growing larger than expected. This is because he or she doesn't use the excess sugar so it's stored as fat in his or her body. This could make labour and birth more difficult. A particular concern is the increased risk of shoulder dystocia. This means that your baby's head can be born, but his or her shoulders become stuck behind your pelvic bone. This can lead to a number of problems including injury to your baby's shoulders or arms, damage to the nerves in his or her neck or, very rarely, brain injury as a result of a lack of oxygen. The staff at the hospital will advise you on the best way for your baby to be born safely.

Your baby may have low blood sugar (hypoglycaemia) for a few days after birth. This will be monitored and only needs treating if the sugar in your baby's blood drops below a certain level.

There is a slightly higher risk of your baby having jaundice, which is fairly common in all newborns. Jaundice is caused by the build-up of bilirubin in the blood. Bilirubin is a yellow substance produced when red blood cells are broken down. The yellow tinge to his or her skin and eyes will fade over a couple of weeks and doesn't usually require treatment. If treatment is required, your baby will be placed under ultraviolet lights to break down the bilirubin in his or her skin.

If your baby is born prematurely, there is a higher chance of him or her having a condition called respiratory distress syndrome. This is because his or her lungs are more immature as a result of the high sugar levels during pregnancy. This condition can lead to further complications for your baby, such as high blood pressure and infections. Your baby can be treated for these problems.

If you have gestational diabetes, there is a higher chance of your son or daughter being obese in later life. Your child will also be more at risk of developing diabetes when he or she is older.

Causes of gestational diabetes

There are a number of factors that can increase your risk of developing gestational diabetes. You're more at risk if you:

  • are overweight or obese
  • have previously given birth to a large baby weighing 4.5kg or more
  • had gestational diabetes in a previous pregnancy
  • have a family history of diabetes (parent, brother or sister who has the condition)
  • have polycystic ovary syndrome

Your family origins may also increase your risk of getting diabetes. The condition particularly affects people whose family backgrounds are South Asian (specifically women whose families come from India, Pakistan or Bangladesh), black Caribbean or Middle Eastern.


Diagnosis of gestational diabetes

At your first antenatal appointment your family doctor or midwife will ask about your medical history and examine you. He or she will check for any risk factors you may have and, based on this, you may be offered tests to find out if you already have diabetes, or are at risk of developing the condition during your pregnancy. This test involves drinking a sugary drink and then having blood samples taken to see how well your body processes the sugar.

Please note that availability and use of specific tests may vary from country to country.


Treatment of gestational diabetes

Your family doctor will refer you to a clinic where the doctors and nurses are experienced in looking after pregnant women with diabetes. You will have more frequent antenatal appointments than women who don't have gestational diabetes.
The treatment for gestational diabetes aims to maintain your blood sugar level within the normal range for someone who doesn't have diabetes. You will need to regularly test your blood sugar level. You will be given advice on how to test it, how often and the level that you're aiming for. You will probably need to do a test every day.


Initially, your doctor or dietitian will advise you on ways to manage your gestational diabetes with diet and exercise changes. This may be all you need to do to keep your blood sugar level within the correct range and help to prevent complications of gestational diabetes. Eating a healthy, balanced diet and doing regular exercise may also help to prevent you getting type 2 diabetes in later life.

Studies have shown that eight in 10 women who have gestational diabetes are able to manage their blood sugar level through exercise and dietary changes alone.

The following healthy eating ideas can help to keep your blood sugar level stable and within the expected range.

Include enough carbohydrates that release their energy slowly, such as wholemeal bread and pasta, oats, brown rice, potatoes, lentils and beans in your meals. These maintain your energy levels without increasing your blood sugar level too much.

  • Eat a variety of lean protein, such as chicken, turkey and tuna (in water).
  • Aim to eat up to two portions of oily fish each week, such as mackerel, sardines, salmon, trout and herring.
  • Try to eat at least five portions of fruit and vegetables every day.
  • Limit the amount of high sugar, salt and fatty food that you eat. These include cakes, biscuits, crisps and fried foods.

Regular moderate-intensity exercise, such as walking, helps to reduce your blood sugar level and promotes a sense of wellbeing. It's recommended that you do at least 30 minutes of activity that gets you slightly breathless each day.
You will need to regularly test your blood sugar level. You will be given advice on how to test it, how often and the level that you're aiming for. You will probably need to do a test every day.

Around one to two women in 10 won't be able to control their gestational diabetes with diet and exercise and will need tablets or insulin injections.
If, after two weeks of making diet and exercise changes, you're still having trouble controlling your blood sugar level, you will be offered different options for medicines that can reduce your blood sugar level.

You may be given tablets such as metformin, which is a medicine that will reduce the level of sugar in your blood.

If these sugar-reducing medicines aren't enough to control your blood sugar level, you will be prescribed insulin to help you manage your gestational diabetes. You will need to take the insulin as an injection. You will be shown how to inject yourself and get advice on when to do this.

It's possible for you to develop hypoglycaemia (sometimes called a 'hypo'). This is when your blood sugar level becomes so low that you may pass out. This can happen if you take too much of your medicines or miss a meal. You may have symptoms of being pale, shaking, feeling hungry and sweating. Your doctor or specialist nurse will explain how to recognise the symptoms of hypoglycaemia, and what to do if it happens. For example, keeping a sugary, soft drink with you is a good idea so that you can drink this if you start noticing signs of hypoglycaemia.

If hypoglycaemia causes you to lose consciousness, you will need an injection of glucose in hospital. It's important that your family and friends know what to do if your blood sugar gets very low and you pass out. If you find it difficult to control your diabetes, you may be given an emergency injection – called glucagon – to keep at home for your family to use if you pass out.

Availability and use of different treatments may vary from country to country. Ask your doctor for advice on your treatment options.

After your baby is born

You and your baby will have your blood sugar levels monitored after he or she has been born to make sure these are back to normal.

Doctors recommend that it's best to breastfeed your baby within 30 minutes of birth to keep your baby's blood sugar at a safe level and then breastfeed every two to three hours thereafter.

If you were taking any medication for diabetes, you can stop these after your baby is born. You will need to have a blood sugar test at your six-week check-up to ensure that your blood sugar has returned to the expected level. If it hasn't, you may be at risk of developing diabetes even though you're no longer pregnant. You will be given further advice and possibly some medicines to manage this condition.


Prevention of type 2 diabetes

If you developed gestational diabetes when you were pregnant, you're more at risk of getting type 2 diabetes later in life. You can help to prevent this happening by eating a healthy, balanced diet and maintaining a healthy weight.
Doing regular exercise is also important – at least 30 minutes of moderate-intensity physical activity every day is recommended for adults.


This section contains answers to common questions about this topic. Questions have been suggested by health professionals, website feedback and requests via email.

How could gestational diabetes affect me during my pregnancy?
Will gestational diabetes affect how my baby is born?
How long will it take for the diabetes to go away once the baby is born?

How could gestational diabetes affect me during my pregnancy?

Being pregnant increases your chances of developing certain health problems. If you have gestational diabetes as well, the risk of some of these conditions is even greater.

Health problems linked to gestational diabetes include the following.

  • Early miscarriage. Diabetes that isn't well controlled can increase your chances of having a miscarriage in the first three months of pregnancy.
  • Pyelonephritis – an infection of your kidneys. Symptoms include a fever, feeling or being sick, pain in your middle and upper back, going to the toilet to pass urine often and finding it painful when you do. You will need to be treated in hospital with antibiotics.
  • Pre-eclampsia. This is a potentially very serious condition that causes high blood pressure and can damage your liver, kidneys, brain and the placenta. The main signs are high blood pressure and protein in your urine. It's important to attend all your antenatal appointments to have your urine and blood pressure checked so doctors can pick up any signs of pre-eclampsia early.
  • Too much amniotic fluid. Amniotic fluid is the fluid around your baby and having too much can lead to early labour and problems for you and your baby. Your doctor and midwife may either monitor you closely or admit you to hospital for treatment, depending on how severe the problem is.
  • Low (hypoglycaemia) and high (hyperglycaemia) blood sugar levels. Both high and low blood sugar levels can be very serious for you and your baby. It's important that you check your blood sugar levels regularly and that you and your friends and family know what to do if you become unwell.

Your midwife or doctor can give you advice and information about how to recognise the signs of low and high blood sugar levels and how to treat them.

If you feel unwell at all during your pregnancy, ask your doctor or midwife for advice.


Will gestational diabetes affect how my baby is born?

If your diabetes is well controlled and you don't have any other major health problems, a normal birth is possible. However, you’re likely to be offered a planned birth either with induced labour or a caesarean section when your pregnancy has reached 38 weeks.

Having diabetes means that your baby may be larger and you may be more likely to have a slow or very painful labour. These are the reasons why you’re more likely to need to have a caesarean section than other women who don't have diabetes. Your midwife and doctor will monitor your pregnancy closely and will discuss your options with you. If your baby is large your doctor is likely to recommend that he or she is delivered at 38 weeks.

During the final part of your pregnancy, your doctor and midwife will talk to you about pain control during your labour. Epidurals can be used safely in women who have diabetes. An epidural completely blocks feeling from the waist down and you will stay awake during the delivery. Once you’re in labour your doctor and midwife will aim to keep your blood sugar levels between 4 and 7mmol/l.This might mean having insulin and glucose through a drip to help keep the levels well controlled.

You and your baby will be closely monitored all of the time that you’re in labour to make sure that everything is happening safely. You will have your baby in a hospital that has the facilities to care for you both, should there be any problems or if you need treatment quickly.  There should also be a doctor who specialises in caring for newborn babies present at the birth.


How long will it take for the diabetes to go away once the baby is born?

Usually diabetes that develops during your pregnancy (gestational diabetes) goes away within a few weeks of the birth of your baby. However, for some women their blood sugar levels don't return to normal and they are diagnosed with diabetes that needs life-long treatment.

You should be able to stop treatment for diabetes, including any insulin injections, after your baby is born. However, your nurse or doctor may give you information about a healthy lifestyle and ask you to make changes, such as being more active or losing weight. Leading a healthy lifestyle can help you to reduce your risk of developing diabetes in the future.

You will be asked to have your blood sugar level tested six weeks after the birth of your baby, to make sure that it has gone back to its pre-pregnancy levels. If the results of this test are normal, you will be asked to have regular checks in the future to monitor your blood sugar levels. This is because, having had gestational diabetes, you're more at risk of developing diabetes in the future than other women.
This includes type 1 or type 2 diabetes and diabetes in pregnancy if you have another baby. You can reduce the likelihood of this by eating the right foods, being active and maintaining the right weight for your height.

If your test result shows that you still have raised blood sugar levels, you will be asked to have further tests to see whether you have type 1 or type 2 diabetes. If tests confirm this, your doctor will discuss your treatment options with you.

Further information

International Diabetes Federation
+32-2-538 55 11



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Related hubs

Diabetes – Primary 1
Pregnancy and childbirth – Primary 2
Diet and nutrition – Secondary 1
Fitness and exercise – Secondary 2

Related topics

Antenatal care
Caesarean delivery
Childbirth – vaginal delivery
Planning for pregnancy
Stages of pregnancy
Type 1 diabetes
Type 2 diabetes

Publication date: December 2011



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