Autism is a neurodevelopmental disorder characterized by impaired social interaction, verbal and non-verbal communication, and restricted and repetitive behavior. Parents usually notice signs in the first two years of their child's life. The signs typically develop gradually, but some children with autism will reach their developmental milestones at a normal pace and then regress.

A boy with autism stacks up cans over and over again.

Zìbìzhèng shì 1-zhǒng shénjīng fāyù zhàng'ài, tèdiǎn shì shèjiāo, yǔyán fēi-yǔyán de gōutōng yǒu wèntí, yǐjí xiànzhìchóngfù de xíngwéi. Fùmǔ tōngcháng zài háizi de tóu liǎng nián fāxiàn jīxiàng. Yībān jīxiàng shì zhújiàn fāzhǎn, dàn yīxiē zìbìzhèng értóng kāitóu fāzhǎn sùdù zhèngcháng, ránhòu dàotuì.