Autism typically begins at 36 months of age or younger and is characterized by three core categories of symptoms: social interaction deficits, communication deficits, narrow interests, and stereotypical repetitive behavioral patterns. Children with this disorder have qualitative deficits in social interactions. In infancy, the child avoids eye contact, lacks interest and responsiveness to human voices, does not expect to be picked up, or is stiff and unwilling to be held close to others. In early childhood, the child still avoids eye contact, often does not respond to calls, does not develop attachment to parents, lacks interest in interacting or playing with peers, does not interact with peers in an appropriate manner, does not form partnerships with peers, does not share happiness with others, and does not seek comfort from others when upset or hurt. After school age, as they grow older and their condition improves, children with the condition may become friendly and affectionate toward their parents and peers, but still clearly lack the interest and behavior to actively interact with others. Although some children are willing to interact with others, there are still problems with the way they interact. They lack understanding of social constants, lack responsiveness to the emotions of others, and are unable to adapt their behavior to social situations. In adulthood, the children still lack the interest in interaction and social skills to establish romantic relationships and get married. Children with this disorder often cry or scream to express their discomfort or needs. Older children may pull an adult’s hand toward something they want. They lack facial expressions and often appear indifferent, rarely nodding, shaking their heads or waving their hands to express their wishes. (2) Speech development is delayed or non-developed, and some children have expressive speech until the age of 2-3, but it gradually decreases or even disappears completely. (4) Impaired verbal ability: Although some children can recite children’s songs and jingles, they seldom communicate verbally, and they do not propose topics, maintain topics, or converse only with stereotyped repetitive phrases, dwelling on the same topic. Narrow interests and repetitive behaviors Children with this disorder lack interest in toys and games that children generally enjoy, but are particularly interested in objects that are not usually toys, such as wheels, bottle caps, and other round, rotating objects. Some children also develop attachment behaviors to inanimate objects such as plastic bottles and wooden sticks. Advertisements and weather forecasts are often more appealing to children than cartoons. The child’s behavior is often stereotypical, such as doing things or playing with toys in the same way, requiring objects to be placed in a fixed location, having to take the same route out of the house, and eating only a few foods over a long period of time. They also often show repetitive movements and strange and bizarre behaviors, such as spinning, jumping repeatedly, staring with hands in front of the eyes, fluttering or walking on the tips of the feet. Other symptoms About 1/3-1/4 of the children have combined epilepsy. Some children may have “autistic aptitudes” in combination with low intelligence, such as musical, calculating, date telling, mechanical memory and recitation.