Young girls are constantly seeing princesses and skinny pretty girls always getting they guy. They grow up believing these stereotypes and have ideas of what they "should" look like and act like. Young boys are viewing baseball and football movies and see the popular cute boy getting the girlfriend and the dorky boys get left in the dust. Boys are also held to a certain stereotype to not be nerdy and to go to the gym and get muscles.
These stereotypes and ideologies are so subliminal that most adults don't even realize them. Children view them everywhere from commercials on TV to pictures in school textbooks. Unfortunately these messages have become such a big part of life there is nothing we can do to prevent it. The only thing we can do is as adults, teach the children how to think and analyze using their own minds and avoiding the influence of the media.