Signs at 9 to 12 Months

The earliest signs of autism involve the absence of normal behaviors—not the presence of abnormal ones—so they can be tough to spot. In some cases, the earliest symptoms of autism are even misinterpreted as signs of a "good baby," since the infant may seem quiet, independent, and undemanding. However, you can catch warning signs early if you know what to look for.

Between the ages of 9 and 12 months, your infant should be crawling and be able to stand if supported. She should be saying words like "mama" and "dada" and be able to search for things that you hide. If you notice that your child is not achieving these milestones, take action. An infant between the ages of 9 and 12 months should also be pointing at things and making gestures with her hands and her head. Of course, if you seen any loss of skills, that is also a warning sign.