Pervasive developmental disorder(PDD)

PDD refers to a group of five disorders characterized by delays in the development of multiple basic functions including socialization and communication. The most general known PDD is Autism. Parents may note symptoms of PDD as early as infancy and typically onset is prior to 3 years of age. NY have several programs for children who are before 3 years old (Functional Life Achievement, INC). I went there to check my son and they said that he need some therapies. We're just wondering their result so he checked again in Korea. In Korea, they could not test him because he was not old enough to test.(my son is 20 month) Me and my wife are still not sure that he got PDD.