Make sure your infant is wearing a wide-brimmed hat or is covered with a canopy. Buy a solar tent. The beauty of a portable tent for parents of more than one child is that you can sit under the tent with your baby while your older children run around in the sun. This means that the time it takes to burn is at least 15 times what it would be without sunscreen. Lotions that block UVA radiation must contain either titanium dioxide, oxybenzone or dioxybenzone.
Titanium dioxide is the preferred ingredient for children because it blocks the most dangerous rays.
It leaves a pasty white layer on the skin temporarily, but this should not bother most kids. A fair number of people have PABA allergies, and it can permanently stain clothes. Octyl methoxycinnamate, the most common UVB protector approved for kids, usually does not cause an allergic reaction. Rub the lotion liberally all over your child's body 30 minutes before the first sun exposure of the day and then every two hours thereafter. If your child is constantly ripping off his or her hat, then try one that ties under the chin.