Infant deaths have increased in the United States since the Supreme Court ruling that overturned Roe vs. Wade and allowed states to make abortion illegal, researchers reported Monday.

The change became detectable three months after the June 2022 ruling with an elevated rate of infant mortality involving babies born with serious congenital anomalies, the researchers found.

By the end of 2023, there were six months when the death rate for infants with severe anatomical problems was significantly higher than in the years leading up to the high court’s decision. The researchers also identified three months when the nation’s overall infant mortality rate had increased.

However, neither of those rates fell below their historical range in the year and a half after the ruling in Dobbs vs. Jackson Women’s Health Organization.

The findings, reported Monday in the journal JAMA Pediatrics, were seen as a clear sign that the Dobbs decision has prevented some women from terminating pregnancies that otherwise would have ended in abortion.