As children enter puberty they are faced with changes they might not be expecting. This can lead to negative and positive feelings of change. Children are faced with media images that can cause low self-esteem. Having support from family and friends during these changes can make a big different in self-esteem.
Primary sexual characteristics, reproductive organs, and secondary sexual characteristics, visible on the outside of the body, begin to change and develop. Menarche can occur in girls and spermarche can occur in boys during middle childhood.
Children refine their running, jumping, hopping, and ball skills. They are using more of the body to perform skills. Boys tend to be stronger and have an edge at batting, kicking, dribbling, and catching. Girls are better at gross motor skills like hopping and skipping that require more balance and agility. Much of these differences might be based on social rather than physical differences.