Rett's Syndrome affects girls almost exclusively.Childhood disintegrative disorder is very similar to autism, but the disorder tends to occur later in childhood and the loss of skills is usually more dramatic. Childhood Disintegrative Disorder is marked by normal development until the age of about three or four years old, followed by a severe loss of communication and social skills.However, children with Asperger's syndrome do not experience the same degree of impairment in intellect and communication as children with autism. Many people confuse Asperger's with mild autism, and the two disorders are very similar. Asperger's Syndrome often remains undiagnosed until the child begins schools.Autism causes difficulties with both verbal and nonverbal communication, impaired social interaction, and repetitive or limited interests and activities. The disorder affects boys four times as often as girls, although the reason for this difference is not clear. Autism is the most well known PDD, and the National Institute of Neurological Disorders and Stroke estimates that as many as six out of every 1,000 children will develop autism.Children who exhibit PDD symptoms, but do not meet the criteria for autism or another PDD, receive a diagnosis of PDD-NOS. Doctors base the diagnosis on symptoms and the results of developmental, cognitive, language, and behavior assessments.įive disorders fall under the diagnostic category of pervasive developmental disorder. Unfortunately, there is no blood or imaging test available to diagnose PDDs. The above symptoms may point toward a PDD.
Remains in the "fencing position" for extended periods.Does not fall into "fencing position" when lying on his or her back.Does not turn head when cheek is caressed.Infants may be missing primitive reflexes.Staring at moving objects like ceiling fans for a very long time.Delays in developmental milestones or regression.Lack of interest in the environment and other people.Repetitive play or playing with toys in an odd manner.Difficulty interacting and playing with others.Using language inappropriately or not at all.Unusual movements, such as spinning or hand flapping.PDD symptoms generally become apparent before a child reaches the age of three, and many parents report noticing signs in their children as early as infancy.
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