A set of New York triplets has made medical history by being the first born with a rare skull malformation, and to be the first to receive corrective surgery.

Newsday reports the three 6-month-old boys—Hunter, Jackson and Kaden—underwent successful surgeries at Stony Brook University Hospital on Long Island when they were 2 months old. On Monday, doctors and first-time parents Michael and Amy Howard, of Center Moriches (moh-RIH'-chihs), talked about the surgeries during a news conference.

Doctors say that the babies were born with craniosynostosis, a skull plate fusion which distorts the skull early and could stunt future brain development.

The likelihood of all three triplets being born with the same malformation is approximately 1 in 160 trillion.