Pay attention to the ways that you form gender in your children's upbringing. Children learn gender at an early age from the people around them--little girls learn to play with dolls, while little boys play with trucks. Often, parents unwittingly encourage this type of gendered play, even going so far as to discourage their child from playing with a toy that is for the "other gender." Additionally, you may encourage a boy to be more active and a girl to play quietly. Watch your own actions and encourage your child to try all of the things that he may like.