Diabetes in Pregnancy: What Every Expecting Mother Should Know

Pregnancy brings many changes to a woman’s body, including changes in the way the body uses insulin and controls blood sugar. For some women, these changes can lead to diabetes during pregnancy.

The good news is that with early diagnosis, appropriate monitoring, healthy lifestyle measures, and medical care, most women with diabetes can have a healthy pregnancy and a healthy baby.

What Is Diabetes in Pregnancy?

Diabetes during pregnancy generally falls into two categories:

1. Gestational Diabetes Mellitus (GDM)

Gestational diabetes is diabetes that develops during pregnancy in a woman who did not previously have diabetes.

During pregnancy, hormonal changes can make the body less sensitive to insulin. When the body cannot produce enough insulin to compensate, blood glucose levels can rise.

Gestational diabetes commonly develops during the second half of pregnancy and is usually screened for between 24 and 28 weeks of pregnancy.

2. Pre-existing Diabetes

Some women enter pregnancy with:

• Type 1 diabetes

• Type 2 diabetes

Women with diabetes before pregnancy require careful monitoring before conception and throughout pregnancy because blood glucose control can affect both maternal health and the developing baby.

Does Gestational Diabetes Cause Symptoms?

One of the challenges with gestational diabetes is that many women do not experience any obvious symptoms.

Occasionally, symptoms may include:

• Increased thirst

• Frequent urination

• Unusual tiredness

• Higher-than-expected blood glucose levels

However, these symptoms can also occur during a normal pregnancy. This is why routine screening is important rather than relying on symptoms alone.

Who Is More Likely to Develop Gestational Diabetes?

Certain factors can increase the likelihood of developing gestational diabetes, including:

• Previous gestational diabetes

• Being overweight before pregnancy

• Family history of type 2 diabetes

• Polycystic ovary syndrome (PCOS)

• Previous delivery of a large baby

• Increasing maternal age

• Prediabetes or abnormal blood glucose before pregnancy

Having one or more risk factors does not mean that a woman will definitely develop gestational diabetes.

Your obstetrician may recommend earlier blood glucose testing when risk factors are present.

How Is Gestational Diabetes Diagnosed?

Gestational diabetes is diagnosed using blood glucose testing.

For women without previously diagnosed diabetes, screening is commonly performed at approximately 24–28 weeks of pregnancy. Women considered at higher risk may require testing earlier.

Depending on the clinical protocol being followed, testing may involve a glucose challenge test or an oral glucose tolerance test (OGTT).

Your obstetrician will interpret the results and determine whether additional monitoring or treatment is required.

Why Is Blood Sugar Control Important During Pregnancy?

Persistently elevated blood glucose can increase the likelihood of complications for both mother and baby.

Possible maternal complications

Diabetes during pregnancy may be associated with an increased risk of:

• High blood pressure and pregnancy-related hypertensive disorders

• Caesarean delivery

• Difficulties related to excessive fetal growth

• Development of type 2 diabetes later in life after gestational diabetes

Possible effects on the baby

Poorly controlled diabetes can increase the likelihood of problems such as:

• Excessive fetal growth or a large baby

• Complications around delivery

• Premature birth

• Blood glucose disturbances after birth

For women who already have type 1 or type 2 diabetes before pregnancy, high blood glucose around the time of conception is also associated with additional pregnancy risks.

These risks are one of the main reasons why early identification and good glucose control are important.

How Is Gestational Diabetes Managed?

Management is individualised according to blood glucose measurements, maternal health, fetal growth, gestational age and other pregnancy-related factors.

Healthy Nutrition

A balanced pregnancy diet can help control blood glucose while providing the nutrients required for maternal health and fetal development.

Rather than completely eliminating carbohydrates, the aim is generally to choose appropriate foods, portions and meal timing under professional guidance.

A doctor or dietitian may recommend adjusting:

• Carbohydrate portions

• Meal frequency

• Refined sugar intake

• Protein intake

• Fibre-rich foods

• Meal and snack timing

Avoid following extreme diets during pregnancy without medical supervision.

Physical Activity

For women without an obstetric contraindication, appropriate physical activity may help improve the way the body uses glucose.

The type and intensity of exercise should be discussed with your obstetrician, particularly in women with high-risk pregnancies.

Blood Glucose Monitoring

Women diagnosed with gestational diabetes may be asked to monitor their blood glucose regularly.

Monitoring allows the healthcare team to understand whether nutrition and activity are maintaining blood glucose within the recommended range.

Medication or Insulin

Many women can manage gestational diabetes through nutrition, physical activity and monitoring. When these measures are not sufficient, medication may be required.

Insulin may be recommended during pregnancy when necessary to achieve appropriate glucose control.

Diabetes medication should never be started, stopped or adjusted during pregnancy without discussing it with the treating doctor.

Will Gestational Diabetes Affect My Delivery?

Having gestational diabetes does not automatically mean that a woman requires a Caesarean section.

The delivery plan depends on several factors, including:

• Blood glucose control

• Baby's growth

• Estimated fetal weight

• Maternal health

• Blood pressure

• Pregnancy complications

• Gestational age

• Previous obstetric history

Your obstetrician will assess these factors during pregnancy and recommend an appropriate delivery plan.

What Happens After Delivery?

For many women with gestational diabetes, blood glucose improves after delivery. However, having gestational diabetes increases the future risk of developing type 2 diabetes.

Women who have had gestational diabetes should therefore continue long-term health monitoring.

The CDC recommends diabetes testing approximately 4–12 weeks after delivery, followed by repeat blood glucose assessment every 1–3 years even when the initial postpartum results are normal.

Maintaining healthy nutrition, appropriate physical activity and a healthy body weight can also form part of long-term diabetes prevention.

Planning Another Pregnancy After Gestational Diabetes

If you have previously had gestational diabetes and are considering another pregnancy, discuss pregnancy planning with your doctor.

Checking blood glucose before conception or early in the next pregnancy can help identify abnormal glucose levels sooner.

Current diabetes guidance also recommends screening women with a history of gestational diabetes when planning a subsequent pregnancy.

Can a Healthy Pregnancy Be Possible With Diabetes?

Yes.

A diagnosis of gestational diabetes does not mean that complications will definitely occur.

Regular antenatal care, appropriate blood glucose monitoring, healthy nutrition, physical activity when appropriate, medication when required, and monitoring of fetal growth can substantially improve pregnancy management.

The objective is not simply to manage a blood glucose number—it is to support the health of both mother and baby throughout pregnancy and after delivery.

When Should You Speak to Your Obstetrician?

Discuss diabetes screening with your obstetrician during routine antenatal visits, particularly if you have:

• A previous history of gestational diabetes

• Type 1 or type 2 diabetes

• PCOS

• A strong family history of diabetes

• Previous abnormal blood glucose results

• Previous delivery of a large baby

• Other risk factors for gestational diabetes

Early evaluation allows an individualized pregnancy-care plan to be developed.