Congenital heart disease (CHD)—a heart condition present from birth—affects some mothers, and doctors have long known it can complicate pregnancy. But does exposure to this condition in the womb affect how a child grows and learns? Researchers in Sweden and Canada set out to answer this question by following a large group of children born between 1995 and 2016.
The study tracked 256,629 children born in British Columbia and assessed their development around age 5–6 using the Early Development Instrument (EDI), a teacher-rated questionnaire completed by over 90% of children in participating schools. Researchers looked for signs of developmental vulnerability—scoring in the bottom 10% in any two of five key areas: physical health, social skills, emotional maturity, language and thinking skills, and communication.
Children of mothers with heart disease showed similar development to others
The study found no significant increase in developmental vulnerability among children whose mothers had congenital heart disease compared to children whose mothers did not. This is reassuring news for mothers living with CHD who worry their condition might harm their child's learning, social abilities, or emotional growth during pregnancy.
What the study does and doesn't tell us
While this research is large and well-designed, it focused only on children in one Canadian province over a specific time period, so findings may not apply to all populations. The study measured development at school entry but did not follow children longer to see if any differences emerged later. Additionally, the research shows association, not direct cause—even if a link were found, it wouldn't prove the mother's heart condition directly caused it, since other factors influence child development too.
For Singapore families with mothers managing congenital heart disease, this Canadian evidence suggests prenatal exposure to maternal CHD is not a major developmental risk factor. However, individual pregnancy complications and overall health management remain important conversations to have with your healthcare provider.