My precious son Kevin showing his autism signs and symptoms

First of all, when you as a parent thinks something is wrong with your child's development and you have been told 'not to worry' or you should 'should wait a little longer' trust your instincts and get your child evaluated.
Not every person with autism manifests all the symptoms and signs of autism.

Red Flags that Parents Should Note:

* does not respond to his/her name.
* cannot explain what he/she wants.
* language skills are slow to develop or speech is delayed.
* doesn't follow directions.
* at times, seems to be deaf.
* doesn't point or wave "bye-bye."
* used to say a few words or babble, but now doesn't.
* throws intense or violent tantrums.
* has odd movement patterns.
* is overly active, uncooperative, or resistant.
* doesn't know how to play with toys.
* doesn't smile when smiled at.
* has poor eye contact.
* gets "stuck" doing the same things over and over and can't move on to other things.
* seems to prefer to play alone.
* gets things for him/herself only.
* is very independent for his/her age.
* does things "early" compared to other children.
* seems to be in his/her "own world."
* seems to tune people out.
* is not interested in other children.
* walks on his/her toes.
* shows unusual attachments to toys, objects, or schedules
(i.e., always holding a string or having to put socks on before pants).
* spends a lot of time lining things up or putting things in a certain order.

Source: Filipek et al. (1999). Screening and diagnosis of autistic spectrum disorders. Journal of Autism and Developmental Disorders, 29(6): 439-484.

Strange behavior patterns are very common and may include repeated mimicking of the actions of others, complex rituals, screaming fits, rhythmic rocking, arm flapping, finger twiddling, and crying without tears. Many of these children may react to sounds by banging their head or flapping fingers.