U.S. fertility rates are at an all-time low, partially due to delayed parenthood, increased childlessness, fewer unplanned teenage pregnancies, and declines in immigration. As explained by Hans-Peter Kohler, Pilar Gonalons-Pons, and Emilio Alberto Parrado in Penn Today, the drop isn’t cause for alarm but does bring to light questions about work, family, and immigration policies that can affect population growth.