Researchers report that eight healthy babies were born with the help of an experimental technique that uses DNA from three people to help mothers avoid passing rare diseases to their children.

Fragile X disorders include two distinct conditions: fragile X syndrome (the most common single-gene cause of developmental delay and autism) and an entirely separate group of premutation syndromes.

A groundbreaking trial in the U.K. has released data on eight babies born through a special IVF procedure to lower their risk ...