The researchers did not compare the infants' brain development to that of other infants who are ill at birth, he added, and long-term studies of the impact of these brain abnormalities are needed.
"Babies with a fetal diagnosis may also be studied with MRI to learn more about how the brain develops when there is congenital heart disease. This will be especially important as cardiologists begin to consider interventions to treat heart conditions before birth -- something that is only being studied at this time," said McQuillen.
The researchers stressed that both of the congenital heart defects in the study required surgery. Parents who have been told their child has a heart murmur but does not need surgery should not worry about related developmental delays, McQuillen and Miller said.
More information
There's more on congenital heart defects at the American Heart Association.
SOURCES: Vidu Garga, M.D., assistant professor, department of pediatrics and molecular biology, University of Texas Southwestern Medical cCenter, pediatric cardiologist at Childrens Medical Center, Dallas; Patrick S. McQuillen, department of pediatrics, University of California, San Francisco; Steven Miller, MDCM, assistant professor, pediatrics, division of neurology, BC Children's Hospital and Child & Family Research Institute, University of British Columbia, Vancouver, Canada; Nov. 8, 2007, New England Journal of Medicine
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