Definately have your child evaluated. If you pediatrician doesn't take you seriously, seek other opinions. Here is some informationn about the signs of autism, from Easter Seals. Having any of the signs indicates that a screening could be in order.
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What are the Signs of Autism?
Spins objects
Sustained odd play
Little or no eye contact *****
Severe language deficits
Insistence on sameness
Uneven gross/fine motor skills (may not kick a ball but can stack blocks)
Laughs, cries or shows distress for no apparent reasons
Noticeable physical over-activity or extreme under-activity
Difficulty expressing needs; gestures or points instead of speaking
Not responsive to verbal cues; acts as if deaf but tests in normal range *****
Echolalia (repeats words or phrases in place of normal responsive language)
Inappropriate attachment to objects
May not want cuddling or act cuddly
Unresponsive to normal teaching methods
Oversensitivity or under-sensitivity to pain
Aloof manner; difficulty mixing with others
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Remember that autism is a *spectrum disorder*, which means that a child could have some symptoms, or all symptoms, or any range of combinations in between. Abilities can range from low functioning, to very highly functioning, to savant capabilities in rare cases, and anything in between these ranges. Not all autistics have zero social skills. Not all are nonverbal. Not all autistics have low intelligence, and in fact the majority have above average intelligence. It is also four times more common in boys than in girls.
Please remember that every child is unique - growing and developing in different ways. Most of the time, differences between children of the same age are nothing to worry about. But for one child in 10, the difference can be related to a developmental delay. If you have any questions or concerns about your child's growth and development, call Help Me Grow/Future for Kids helpline at 1-800-323-GROW (4769).