Based on the dimension difference of adults and children, the comfortable height and depth of washbasin for adults cannot be used by children. Although children grow up very fast, it still needs to take several years for them to be tall enough to use the washbasin that suits adults. This design considers the grow up of the children. When the kid is old enough to brush his teeth on his own, he can open the door of the fence and step onto the foot pad easily. When he is brushing his teeth and wash his face, the fence will protect him from slipping. After he grow up a little taller, the foot pad and fence can be removed, and he can use the faucet from the side that was the foot pad of the washbasin, where the faucet is closer than the other side, which is for the adults. After he become tall enough, he can use the washbasin as the adult since he is already an adult.