The findings are not that surprising, given what's known about advancing maternal age on other birth-related conditions, Dawson said. Previous research has shown that older moms are at higher risk of miscarriage or delivering low birth-weight babies, and of having babies with chromosomal aberrations such as Down syndrome and congenital anomalies.
"We've known for a long time that advanced parental age is associated with changes in the DNA, more chromosomal abnormalities and more birth complications," Dawson said. "Still, overall the risk [for any one couple] is small."
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