A study suggests too much television might be bad for very young children -- possibly even leading to an increased risk of attention deficit problems by school age. The study says excess television for one and three-year-olds might overstimulate and permanently "rewire" the developing brain. The study says that for every hour of television watched daily, the two age groups have a ten percent greater risk of attention problems at age seven. The findings bolster previous research showing television can shorten attention spans. They also support American Academy of Pediatrics recommendations that youngsters younger than two not watch television. The latest study appears in the April issue of Pediatrics. The researchers depended on parents' characterizations of their kids' attention problems, which included difficulty concentrating, restlessness, impulsiveness, and being easily confused.