The first 2 years of life are considered a critical time for brain development. TV and other electronic media can get in the way of exploring, playing, and interacting with parents and others, which encourages learning and healthy physical and social development.

Children who consistently spend more than 4 hours per day watching TV are more likely to be overweight. Kids who view violent acts are more likely to show aggressive behavior but also fear that the world is scary and that something bad will happen to them. TV characters often depict risky behaviors, such as smoking and drinking, and also reinforce gender-role and racial stereotypes.