Child may have confused, even hostile, feelings towards children of the opposite sex. D.8 through 12 Years of Age 1. Peer group has increased influence on child's self-image. Child begins to separate from parents. Child begins to experience body changes during puberty.
Some girls begin to menstruate.
Child may feel modest. Child may masturbate, sometimes to orgasm. Child hides sex play from parents. E. 13 Years of Age and On 1. On the average, boys develop about 2 years later than girls.