When it comes to baby shampoo, there is no definitive answer as to how long it can be used. However, most experts agree that you should discontinue use once your child reaches the age of two or three. This is because babies have sensitive skin and scalps, and using adult shampoo can cause irritation. Additionally, baby shampoo is designed to be gentle and tear-free, so it may not clean your child’s hair as effectively as an adult shampoo. If you are unsure about whether or not to continue using baby shampoo, consult your child’s pediatrician for guidance.