‘Three-parent babies’ explained

IVF technique that led to recent birth of boy one of several

Zhang with baby

IT’S A BOY  Fertility doctor John Zhang holds a baby boy (face blurred for privacy) who is the world’s first child created by a mitochondrial replacement technique called spindle transfer. Such children have been dubbed “three-parent babies.”

New Hope Fertility Center

A 6-month-old baby boy may have opened the door to a new world of reproductive medicine.