Some babies are being exposed to the sun’s damaging ultraviolet (UV) rays in the first six months of life, when their skin is most vulnerable. In fact, a research team at the University of Miami found that as many as one-third of local parents actively increased their infant’s sun exposure each day, believing mistakenly that it would build their babies’ tolerance to the sun’s rays. As a result, 12 percent of the parents reported that their babies’ skin had tanned before they were six months old, and three percent said their infants had been sunburned.

“Sun exposure can be ext...