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How Does Gestational Diabetes Affect the Baby?

Oct 13, 2026

Gestational diabetes (GDM) can affect a baby when blood sugar remains high during pregnancy. The good news: with early diagnosis and good blood-sugar management, most people with GDM have healthy pregnancies and healthy babies.

Why It Happens

Glucose crosses the placenta from the mother to the baby. If the mother’s blood sugar is frequently high, the baby receives extra glucose, produces more insulin, and may store the excess energy as fat—leading to faster-than-normal growth.

Possible Effects on the Baby

Larger birth weight (macrosomia): Extra glucose and insulin can make the baby grow larger than usual, which may increase the chance of delivery complications, shoulder injury, or a C-section.
Low blood sugar after birth: After delivery, the baby’s insulin may remain high even though the glucose supply from the mother stops. This can cause temporary low blood sugar (hypoglycemia), usually managed with early feeding and monitoring.
Breathing difficulties: Babies exposed to high blood sugar may have less mature lungs, and those born early may be more likely to develop breathing problems.
Jaundice: Higher bilirubin levels can cause newborn jaundice, which is common and usually treatable.
Preterm birth: GDM may raise the risk of early labor or an earlier medically advised delivery, especially if the baby is growing very large.mayoclinic
Long-term metabolic risk: Children exposed to uncontrolled high blood sugar in the womb may have a higher risk of obesity and type 2 diabetes later in life.
Rare serious risks: Untreated or poorly controlled GDM can increase the risk of stillbirth, which is why regular monitoring and treatment matter.mayoclinic

How to Protect Your Baby

Managing gestational diabetes greatly lowers these risks. Key steps include:

Follow the meal plan and carbohydrate guidance given by your doctor or dietitian.
Choose fiber-rich foods, adequate protein, and controlled portions.
Stay active as advised, such as walking after meals.
Monitor blood sugar regularly.
Take insulin or other prescribed medication if needed.
Attend all prenatal check-ups and fetal growth scans.