Autism varies widely in its severity and symptoms and may go unrecognized, especially in mildly affected children or when it is masked by more debilitating handicaps. Doctors rely on a core group of behaviors to alert them to the possibility of a diagnosis of autism. These behaviors are:

impaired ability to make friends with peers
impaired ability to initiate or sustain a conversation with others
absence or impairment of imaginative and social play
stereotyped, repetitive, or unusual use of language
restricted patterns of interest that are abnormal in intensity or focus
preoccupation with certain objects or subjects
inflexible adherence to specific routines or rituals
Doctors will often use a questionnaire or other screening instrument to gather information about a child’s development and behavior. some screening instruments rely solely on parent observations; others rely on a combination of parent and doctor observations. if screening instruments indicate the possibility of autism, doctors will ask for a more comprehensive evaluation.

Autism is a complex disorder. A comprehensive evaluation requires a multidisciplinary team including a psychologist, neurologist, psychiatrist, speech therapist, and other professionals who diagnose children with ASDs. the team members will conduct a thorough neurological assessment and in-depth cognitive and language testing. because hearing problems can cause behaviors that could be mistaken for autism, children with delayed speech development should also have their hearing tested. after a thorough evaluation, the team usually meets with parents to explain the results of the evaluation and present the diagnosis.

Children with some symptoms of autism, but not enough to be diagnosed with classical autism, are often diagnosed with PDD-NOS. Children with autistic behaviors but well-developed language skills are often diagnosed with Asperger syndrome. Children who develop normally and then suddenly deteriorate between the ages of 3 to 10 years and show marked autistic behaviors may be diagnosed with childhood disintegrative disorder. Girls with autistic symptoms may be suffering from Rett syndrome, a sex-linked genetic disorder characterized by social withdrawal, regressed language skills, and hand wringing. hope this helps

I have two children with autism and their symptoms at a young age were very different. My son who is high functioning was able to maintain eye contact and was very quiet and content as a baby (too quiet). He didn't show much interest in toys but it wasn't until about 14 months, then lack of speech was the first definite sign. My daughter on the other hand was an extremely fractious and unsettled baby who cried unless she was being fed. Had no eye contact and became severely distressed over obscure things like bright lights, public places and things on television. i can remember from a very young age trying to cover her ears alot. Autism is very individual to the child but if you feel that something isn't quite right. go to your GP or clinic as EARLY diagnosis is the best way to move your child's development forward.

no creases on their feet or hands..
irregular eye movement. (Darting, unable to focus, or hold eyes still.)
twitching, or a tick of somekind usually.(Not always)
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