In general, puberty is normal for 12-year-olds. Boys usually reach puberty around age 12, and girls slightly earlier, around age 10. However, there may be variations for each child, as long as they are within a certain range, they are normal. So 12-year-old children puberty development is mostly normal, parents do not need to worry too much, do a good job of the correct guidance can be. In the growth process of children, puberty is a very important stage, they are in this stage from physical to psychological have a qualitative change, parents should be prepared to give children the right guidance to help them through.