Early signs of autism in children
•By 6 months: No big smiles or other warm, joyful expressions.
•By 9 months: No back-and-forth sharing of sounds, smiles, or other facial expressions.
•By 12 months: Lack of response to name.
•By 12 months: No babbling or “baby talk.”
•By 12 months: No back-and-forth gestures, such as pointing, showing, reaching, or waving.
•By 16 months: No spoken words.
•By 24 months: No meaningful two-word phrases that don’t involve imitating or repeating.