“In the past”, says Furkan Kayabasoglu, an obstetrician in Istanbul, “I would deliver a couple’s first baby and then their second or even a third.” These days, however, “one and done” parents are ...

The U.S. fertility rate has dropped to its lowest level in decades — and the number of births is far lower than deaths in many states. We looked at fertility rates (or the number of births per 1,000 ...