The 5-month-old is thriving after undergoing what doctors say was the first high-risk in-utero surgery of its kind in the U.S.

The historic procedure took place earlier this year, as a UK mother underwent surgery over in Texas

LONDON, Aug 3 — Baby Theo is only five months old, but he has already made medical history after surgeons repaired a serious birth defect while he was still in the womb.Theo...