A mother in Kazakhstan is celebrating the birth of a son almost three months after his twin sister was delivered. The 77-day wait—10 days shy of the world record interval for twin births—isn't all that makes this one exceedingly rare, per Live Science. According to the country's health ministry, there was just a one-in-50-million chance that a baby would develop in each of mother Lilliya Konovalova's two uteruses—the result of a condition called uterus didelphys, which is caused when the two tubes that usually form the uterus develop into separate wombs. The health ministry said it was the first case of its kind in Kazakhstan, reports the Mirror.
Konovalova, who gave birth to a daughter seven years ago, only learned of her condition as the first twin, Liya, was born at 25 weeks on May 24, weighing 1 pound, 13 ounces. "I was so worried about the life of my premature baby. But our doctors were great. What they did was a miracle," says the 29-year-old. She remained at the regional perinatal center to care for Liya, who spent a month in intensive care, and await the second birth, per the Mirror. "My son was in no rush," she jokes. Born Aug. 9 weighing 6 pounds, 6 ounces, Maxim is now close to 10 pounds, as is Liya. The family is now preparing to return home. (A similar birth occurred this year in India.)