Why do kids and toddlers need rashguards? Our rashguards have built-in sun protection of UPF 50+, which is like wearing a layer of sunscreen without the icky chemicals and mess! Baby and toddler rashguards protect your child's back, chest, shoulders, and even arms (if wearing a long sleeve rashguard) from the sun's damaging rays. Toddler rashguards also offer your child protection from chest/back abrasion during water sports. Our cute baby and toddler rashguards fit children as young as six months through about age 4 and coordinate with our toddler swimsuits, swim diapers, and sun hats for babies and toddlers. Rashguards can be worn over swimsuits, worn alone as shirts, or paired with swim diapers.