Gestational diabetes is high blood sugar that develops during pregnancy and usually goes away after delivery

Gestational diabetes happens when your body cannot produce enough insulin to handle the extra glucose in your blood during pregnancy. It does not mean you had diabetes before you became pregnant, and it does not automatically mean you will have diabetes after your baby is born. However, it does require monitoring and management during the rest of your pregnancy to protect both your health and your baby's.

The condition is detected through a screening test, usually between weeks 24 and 28 of pregnancy. If your test shows high blood sugar, your doctor will ask you to take a longer test to confirm the diagnosis. Once confirmed, you will work with your healthcare team — often including an obstetrician, a diabetes educator, and a dietitian — to keep your blood sugar in a safe range.

Key Takeaways

  • Gestational diabetes is screened for between weeks 24 and 28 of pregnancy using a glucose tolerance test.
  • Most cases are managed through changes to diet and physical activity, without insulin or medication.
  • Unmanaged gestational diabetes can lead to larger birth weight, low blood sugar in the newborn, and complications during delivery.
  • After delivery, your blood sugar usually returns to normal, but you will need a follow-up test to confirm.
  • Having gestational diabetes increases your risk of developing type 2 diabetes later in life, so ongoing monitoring is important.

How gestational diabetes is detected and diagnosed

Your doctor will order a glucose screening test, usually called the glucose challenge test or GCT. You drink a sweet liquid and have your blood drawn one hour later. If that result is higher than the threshold your lab uses, you will be asked to take a longer test called the oral glucose tolerance test, or OGTT. For this test, you fast overnight, drink a sweeter liquid, and have your blood drawn at specific intervals over two to three hours.

The numbers that define gestational diabetes vary slightly by lab and by the guidelines your healthcare provider follows. Your doctor will explain what your results mean and whether you have been diagnosed. If you have, you will receive information about diet, activity, and blood sugar monitoring before your next appointment.

Managing blood sugar through diet and activity

Most people with gestational diabetes control their blood sugar by changing what and how much they eat. A dietitian can help you build a meal plan that spreads carbohydrates throughout the day and pairs them with protein and healthy fats, which slows how fast glucose enters your bloodstream. Portion sizes matter, and keeping a food record for a few days helps you and your dietitian see patterns.

Moderate physical activity also helps your body use insulin more effectively. Walking after meals, swimming, or stationary cycling for 10 to 15 minutes can lower blood sugar spikes. Talk with your doctor about what activities are safe for you during pregnancy — most people can continue their normal exercise routine, but some pregnancies require modifications.

Your healthcare team will teach you to check your blood sugar at home using a small meter and finger prick. You will test at specific times — usually fasting and after meals — and keep a log to share at your appointments. This information helps your doctor see whether your plan is working or whether medication is needed.

When insulin or medication becomes necessary

If diet and activity do not bring your blood sugar into the target range after one to two weeks, your doctor may prescribe insulin or a medication like metformin. Insulin does not cross the placenta and is considered safe during pregnancy. You will learn to inject it yourself, usually before meals or at bedtime, and your doses may change as your pregnancy progresses.

Some doctors prescribe oral medications instead of or alongside insulin. The choice depends on your blood sugar patterns, your preferences, and your doctor's judgment. Both insulin and oral medications work alongside your diet and activity changes, not instead of them.

Risks to your baby and what monitoring looks like

High blood sugar during pregnancy can cause your baby to grow larger than typical, which may lead to complications during labor and delivery. Babies born to mothers with gestational diabetes sometimes have low blood sugar right after birth because their bodies produced extra insulin in response to the mother's high blood sugar. This is usually temporary and is managed by feeding the baby frequently or, if needed, giving glucose by mouth or IV.

Your doctor will monitor your baby's growth and development through ultrasounds and may do additional fetal monitoring in the weeks before delivery. These checks help your team plan the safest way for you to deliver. Most babies born to mothers with gestational diabetes are healthy, especially when blood sugar has been well controlled.

What happens after your baby is born

Your blood sugar usually returns to normal within days or weeks after delivery. However, you will need a follow-up glucose test, typically six weeks after birth, to confirm that your blood sugar has returned to the non-pregnant range. This test is important because it establishes your baseline and helps your doctor know whether you need ongoing monitoring.

Having had gestational diabetes means your risk of developing type 2 diabetes is higher than average. Your doctor may recommend periodic blood sugar testing — usually every one to three years — to catch any changes early. Maintaining a healthy weight, staying physically active, and eating a balanced diet reduce your risk significantly.

Planning for future pregnancies

If you plan to have another baby, talk with your doctor before you become pregnant. Some women have gestational diabetes in one pregnancy and not in another; others have it repeatedly. Your doctor can discuss your individual risk and may recommend earlier screening in your next pregnancy.

Losing weight before pregnancy, if that applies to you, and staying active both lower your risk. If you do develop gestational diabetes again, you and your healthcare team will know what to expect and how to manage it.

Frequently Asked Questions

Did I cause gestational diabetes by eating too much sugar?

No. Gestational diabetes happens because pregnancy hormones change how your body uses insulin, not because of anything you did or did not eat. It is not a reflection of your diet before pregnancy. Managing it now through diet and activity is about protecting your health and your baby's during the rest of your pregnancy.

Will my baby have diabetes because I have gestational diabetes?

Not necessarily. Your baby's risk of developing type 2 diabetes later in life is higher than average, but it is not may provide. Healthy weight, regular activity, and good nutrition throughout your child's life reduce that risk significantly.

Can I breastfeed if I had gestational diabetes?

Yes. Breastfeeding is safe and is actually recommended. It does not affect your blood sugar management and may even help lower your long-term risk of type 2 diabetes. Talk with your doctor or a lactation specialist if you have concerns.

What if my blood sugar stays high after delivery?

If your follow-up test shows blood sugar is still elevated after six weeks, your doctor will discuss next steps with you. This is less common but does happen, and it means your healthcare team will monitor you more closely and may recommend lifestyle changes or medication to prevent type 2 diabetes.

How often do I need blood sugar testing after gestational diabetes?

Most doctors recommend testing every one to three years, depending on your results and your risk factors. Some recommend annual testing; others space it out longer if early results are normal. Your doctor will tell you what schedule makes sense for you.