Twin Births in the U.S. Are Dropping, and Experts Have a Theory

Researchers believe that the decline may be connected to advances in embryo transfers during in vitro fertilization. BY CHRISTINE HAUSER https://ift.tt/2o5NRQo https://ift.tt/2AGLTbx New York Times Health Birth Rates, Infertility, Pregnancy and Childbirth, In Vitro Fertilization October 4, 2019 at 10:36PM