For proper haircare, you don't want to wash your baby's hair every night two or three times a week should be plenty. Of course, you know if your baby's hair is dirty, so follow your instinct if you feel the need to add an extra wash in the week. Just keep in mind that overwashing can dry out your little one's skin, so it's best to take days off between shampoos. At bathtime on the off-days, just rinse your baby's scalp with warm water and gently pat dry.