Gen Z is hopping on planes for more than adventure—they’re doing it to have babies. A growing number of young American parents are choosing to give birth outside the U.S., often in countries with better healthcare, more generous parental leave, and cheaper delivery costs. According to a new survey from Greenback Expat Tax Services, more than one in four Gen Z expats have already given birth abroad—and nearly two-thirds say they’re planning to. Among all U.S. expats surveyed, 54% had already had a child while living abroad. Millennials lead the charge with nearly 3 in 5 reporting overseas births, but...