There are children who may have played together as toddlers, but by the time they've reached school age, their attitude toward the opposite sex has changed.
Experts say children develop a powerful identity as either boys or girls.
Psychologist, Dr. Kyle Pruett says, They have understood that boys and girls are different, and they're trying to learn the rules. I think it's a wise idea not to be completely taken in by the child's choices. If they are going to have good friends of both genders for the rest of their lives, it's important that you encourage their continued connection with children of the opposite gender. You can help your child find common ground with the opposite sex. Provide coed opportunities - Provide her with opportunities to play a game that boys and girls both like.