Congratulations, It’s Twins. The Doctor Is Perplexed.

It seems like it should not be possible, but a recent case showed that sometimes a boy and a girl are born as semi-identical twins. HEATHER MURPHY https://ift.tt/2VOlhya https://ift.tt/2Ca59j8 The New York Times Health Twins, Genetics and Heredity, Pregnancy and Childbirth, Reproduction (Biological), your-feed-science March 8, 2019 at 12:00AM