In health news, researchers say the world's first baby has been born using a controversial new technique using DNA from three parents.

The baby's mom carries genes for a rare disorder called Leigh Syndrome, so doctors used the sperm of the father and two eggs to switch out the DNA, which could carry the gene. The procedure isn't approved in the U.S., so the parents went to Mexico. A similar technique has been used in the United Kingdom.

Good news- The baby is now nearly 6 months old and doing great, giving other parents with genetic struggles hope.