Gram Research analysis shows that gestational diabetes is associated with lasting changes to baby’s heart structure and function. A 2026 prospective cohort study of 183 pregnant women found that babies of mothers with gestational diabetes had thicker heart walls and weaker heart pumping ability both before birth and at 6 weeks after birth, compared to babies of mothers without gestational diabetes. These cardiac changes persisted from mid-pregnancy through the early postnatal period.
A new study of 183 pregnant women found that mothers with gestational diabetes (high blood sugar during pregnancy) have babies with changes in heart structure and function, both before birth and after. Researchers used ultrasound to examine fetal hearts between 24 and 28 weeks of pregnancy and again when babies were about 6 weeks old. Babies born to mothers with gestational diabetes had thicker heart walls and weaker pumping ability compared to babies of mothers without the condition. These cardiac changes persisted even after birth, suggesting gestational diabetes may have lasting effects on infant heart development.
Key Statistics
A 2026 prospective cohort study of 183 pregnant women found that babies of mothers with gestational diabetes had significantly thicker left ventricular walls and interventricular septa compared to babies of mothers without gestational diabetes.
According to research reviewed by Gram, fetuses of mothers with gestational diabetes showed significantly reduced right ventricular ejection fraction, indicating weaker heart pumping ability, with these changes persisting at 6 weeks after birth.
In a cohort study of 64 women with gestational diabetes and 119 without, cardiac changes in fetuses were present by mid-pregnancy (24 to 28 weeks gestation) and remained detectable in infants at approximately 42 days after birth.
The Quick Take
- What they studied: Whether mothers with gestational diabetes (high blood sugar during pregnancy) have babies with different heart structure and function compared to babies of mothers without this condition
- Who participated: 183 pregnant women total: 64 with gestational diabetes and 119 without. All were examined during mid-pregnancy (around 24 to 28 weeks) and their babies were checked again at about 6 weeks after birth.
- Key finding: Babies of mothers with gestational diabetes had thicker heart walls and weaker heart pumping ability both before birth and after birth, compared to babies of mothers without gestational diabetes
- What it means for you: If you have gestational diabetes, your baby’s heart may develop differently. Close monitoring during pregnancy and after birth may help catch any heart changes early. This doesn’t mean your baby will definitely have heart problems, but it’s important to work with your doctor to manage your blood sugar during pregnancy.
The Research Details
This was a prospective cohort study, which means researchers followed two groups of pregnant women forward in time and compared their outcomes. One group had gestational diabetes (64 women), and the other group had normal blood sugar levels (119 women). Both groups had their babies’ hearts examined using echocardiography, a type of ultrasound that shows how the heart looks and works. The first heart check happened between 24 and 28 weeks of pregnancy when the baby was still in the womb. The second check happened about 6 weeks after the babies were born. Researchers measured specific parts of the heart, including wall thickness and how well the heart pumped blood.
This research approach is important because it follows real pregnancies over time rather than just looking at one moment in time. By checking babies’ hearts both before and after birth, researchers could see whether heart changes start in the womb and continue after birth. This helps doctors understand if gestational diabetes causes lasting effects on heart development or if changes happen only temporarily.
This study has moderate strength. The sample size of 183 women is reasonable for this type of research. All participants were examined at similar stages of pregnancy, which makes the comparison fair. However, the study only included women from one location, so results may not apply to all populations. The researchers used standard ultrasound measurements, which is a reliable method. One strength is that they followed babies after birth, showing that changes weren’t just temporary.
What the Results Show
Compared to babies of mothers without gestational diabetes, babies of mothers with gestational diabetes showed three main heart changes. First, the walls of the left side of the heart (the main pumping chamber) were thicker. Second, the wall between the two lower chambers of the heart (called the interventricular septum) was also thicker. Third, the right side of the heart pumped less effectively, meaning it wasn’t moving blood as efficiently as it should. These differences were statistically significant, meaning they were unlikely to happen by chance. Importantly, these changes were visible both before birth and when babies were checked again at 6 weeks old, suggesting the effects persist after birth.
When researchers looked only at mothers with gestational diabetes and compared those who controlled their blood sugar with diet alone versus those who needed insulin injections, they found no significant differences in their babies’ heart measurements. This suggests that how gestational diabetes is treated may not change the heart effects, though both groups still showed heart changes compared to the control group. The study also confirmed that both groups were examined at similar stages of pregnancy, so differences in timing didn’t affect the results.
Previous research has suggested that gestational diabetes might affect fetal heart development, but this study provides clearer evidence by measuring specific heart structures and following babies after birth. Earlier studies often looked at only one time point or didn’t measure the heart as thoroughly. This research adds to growing evidence that maternal blood sugar problems during pregnancy can have effects on the developing baby’s heart that continue into infancy.
This study has several important limitations. It included only 64 women with gestational diabetes, which is a relatively small group. All participants came from a single location, so results may not apply to different populations or ethnic groups. The study didn’t follow babies beyond 6 weeks of age, so we don’t know if heart changes continue, improve, or worsen as babies grow. The research also didn’t examine whether these heart changes caused any actual health problems for the babies. Additionally, the study didn’t measure how well mothers controlled their blood sugar levels, which might affect results.
The Bottom Line
If you have gestational diabetes, work closely with your healthcare team to manage your blood sugar through diet, exercise, and medication if needed. Request fetal echocardiography (heart ultrasound) during mid-pregnancy to establish a baseline of your baby’s heart structure and function. Plan for your baby to have a heart check at 6 weeks after birth and discuss with your pediatrician whether additional heart monitoring is needed. These recommendations are based on moderate evidence from this study, so discuss individual circumstances with your doctor.
Pregnant women with gestational diabetes should pay special attention to this research. Healthcare providers caring for these mothers should consider it when planning prenatal monitoring. Pediatricians caring for babies born to mothers with gestational diabetes may want to include heart assessment in their newborn evaluation. Mothers without gestational diabetes can use this as motivation to maintain healthy blood sugar levels during pregnancy. This research is less relevant for women who don’t have gestational diabetes, though maintaining overall health during pregnancy remains important.
Heart changes from gestational diabetes appear to develop during pregnancy and are visible by mid-pregnancy (around 24 to 28 weeks). These changes persist at least through 6 weeks after birth. It’s unknown whether changes improve, stay the same, or worsen as babies grow older. Mothers should expect ongoing monitoring rather than quick resolution of these cardiac changes.
Frequently Asked Questions
Does gestational diabetes cause permanent heart problems in babies?
This study found heart structure and function changes in babies of mothers with gestational diabetes that persisted through 6 weeks after birth. However, the research didn’t determine if these changes cause actual health problems or whether they improve as babies grow older. Long-term follow-up studies are needed.
Can controlling gestational diabetes with diet prevent heart changes in the baby?
This study found no significant differences in fetal heart measurements between mothers who controlled gestational diabetes with diet alone versus those who needed insulin. Both groups showed heart changes compared to mothers without gestational diabetes, suggesting the condition itself affects heart development regardless of treatment type.
What heart changes happen in babies of mothers with gestational diabetes?
Babies showed thicker heart walls, particularly in the left ventricle and the wall between heart chambers, plus weaker pumping ability in the right side of the heart. These changes were visible on ultrasound during mid-pregnancy and remained present when babies were checked at 6 weeks old.
Should my baby have heart screening if I had gestational diabetes?
This research suggests babies of mothers with gestational diabetes should have heart evaluation. Discuss with your pediatrician about fetal echocardiography during pregnancy and infant heart assessment after birth to establish baseline measurements and monitor for any changes.
How common are heart problems in babies born to mothers with gestational diabetes?
This study documented structural and functional heart changes in babies of mothers with gestational diabetes but didn’t report whether these changes caused actual health problems or symptoms. More research is needed to determine how many babies experience clinically significant heart issues.
Want to Apply This Research?
- Log blood sugar readings daily if you have gestational diabetes, noting fasting levels and readings 2 hours after meals. Track the specific target ranges your doctor recommends and note which foods and activities help keep levels in range.
- Set reminders for regular physical activity (30 minutes most days), log meals to identify blood sugar patterns, and schedule prenatal appointments including fetal echocardiography. After birth, schedule and track your baby’s cardiac follow-up appointments.
- Create a pregnancy health dashboard showing blood sugar trends, weight gain, blood pressure, and appointment dates. After birth, track your baby’s feeding, growth, and scheduled cardiac check-ups. Share this data with your healthcare team at each visit.
This research describes associations between gestational diabetes and fetal heart changes but does not establish that gestational diabetes definitively causes heart disease in babies. Individual outcomes vary significantly. If you have gestational diabetes or are concerned about your baby’s heart health, consult with your obstetrician and pediatrician for personalized medical advice. Do not use this information to self-diagnose or replace professional medical evaluation. This article summarizes research findings and should not be considered medical advice.
This research translation is published by Gram Research, the science division of Gram, an AI-powered nutrition tracking app.