If your child is younger than 24 months (2 years old), you should screen again at the 2-year check-up. In addition, some mild forms of autism (like Asperger’s Disorder) may not appear until the child is closer to school age. Therefore, at any age, if you are concerned that your child has lost skills, is not gaining social or communication skills as expected, or is showing odd behaviors, you should talk to your child’s doctor.