how old does a baby have to be to use sunscreen
1 For babies 6 months or older. 2  If your baby is 6 months or older, liberally use sunscreen. 3  Also, avoid exposing your baby to the sun during peak hours â generally 10 a.m. to 2 p.m. â and dress your baby in protective clothing, a hat with a brim and sunglasses. 4  For babies younger than 6 months.