not making eye contact with her mother since she was a child, not looking directly at the opposite person or looking like no one is there, indifferent, indistinguishable from strangers and acquaintances; not showing love and attachment to her mother; Do not follow their mother, do not know how to be happy when their parents go home.When they go to school, children do not like to play with their friends, do not realize that the teacher scolds or compliments, leading to inappropriate things Children speak monotonous sounds, lack intonation, mimic other people’s words, mutter alone, sometimes sound meaningless and repetitive. Do not know how to imitate adults to follow, follow; When there is a need, the child does not know how to make the adult understand what he needs; must suggest the instructions many times before they can follow. Children hate change very much: angry or very frightened when the furniture changes, the mother changes hairstyles …. For external stimuli, sometimes the child overresponsive, or poorly responds. Children can ignore their parents’ words, but find it interesting with the small sounds they make themselves, such as scratching, knocking on objects in their ears. Children do not fear when in danger, injure themselves, hit the head, scratch, pull hair … Children with autism may have abnormal movements such as slowing down due to decreased muscle tone. . Unusual movements: grimacing, hand waving, shaking, head banging Scientists around the world and in the country have many studies on the cause of autism, but so far it is not known exactly what causes it. There are many theories that suggest that the disease may be related to a gene passed down by a child’s parents and other things, like an infection or a toxin, change the way the brain develops. Problems during pregnancy and the length of time to give birth also increase the risk of autism.