At what age should children wipe their own bottom?

As, soon as possible. There is no other way to put it! It is best for the child to be self sufficient in that area before he or she starts any preschool classes. The embarrassment alone of a mishap in front of their peers can be very stressful and can also bring along with it some fairly serious health risks for themselves and the other children. If you don't take the easy way out and work with them every time, almost all children 2 and up can grasp this in a matter of weeks and in some cases a few days. also they should learn how to at the age of around 4 years old.