PDDs called as "pervasive development disorders," it refers to a group of conditions that involve delays in the development of many basic skills, most notably the ability to socialize with others, to communicate, and to use imagination. These conditions are seen in Children around 3 years of age they often confused in their thinking and generally have problems in understanding the world and the thing going around them. There are five types of PDDs Autism, Asperger′s syndrome, Asperger′s syndrome, Rett′s syndrome and Pervasive development disorder not otherwise specified (PDDNOS). General symptoms include Difficulty with verbal communication, social interaction, adjusting to changes.
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