When states give driver’s licenses to undocumented immigrants, it affects nondrivers, too — even the littlest ones. Babies born to immigrants from Mexico and Central America are bigger and healthier in states that make that change, our research shows[1]. The longer a law is in effect before a baby is conceived, the stronger the effect.
We are a sociologist[2] and an epidemiologist[3] who examined the birth records of more...