Red Flags (signs of autism before 2 years of age)

Few smiles or expressions of enthausiasm until 6 months of age

No sharing of sounds and/or smiles until 9 months of age

Absence of babbling up to 1 year of life

Absence of shared gestures up to 1 year of life

Have a sibling that has autism

Absence of shared attention in looking and gestures

No simple words until 16 months of age.

Absence in the speech of sentences of up to 2 words with meaning (without imitating)

Regression of speech and social skills at any age.

Atypical, strange, repetitive behaviors