There has been a rise in the number of children in the United States with autism, according to the CDC's latest report. With one in 88 children diagnosed with the disorder, it's more important than ever for parents to be on the lookout for signs of developmental delay. While autism is not typically diagnosed until a child is 3 years old, parents may be able to notice red flags in their child's behavior as early as 6 months of age. Here are 10 early warning signs to be on the lookout for as highlighted by the American Academy of Pediatrics. If you do notice any of them, try not to panic. However, you should alert your pediatrician as soon as possible to see if further testing is warranted.