AMA Recommends: Keep Kids Under 2 Away From Electronic Media
Six major American medical associations — the American Psychological Association, the American Academy of Pediatricians, the American Medical Association, the American Academy of Child and Adolescent Psychiatry, the American Academy of Family Physicians, and the American Psychiatric Association — all recommend the same action item to parents: no electronic media at all for children who are under years old, and for children who are above two, to limit it very strictly. See this book excerpt for more details.
Although we have not seen the studies on which the recommendations are based, it is noteworthy that the recommendation is so strong, and so consistent.
The quoted book also notes that the average American child spends three hours per day using electronic media.
Personally, this is one rule that I’m following very strictly with my baby. Although he seems to be the only baby in his playgroup who doesn’t know how to use an iPad!