Autism, also known as autism spectrum disorder (autism), is classified as a neurodevelopmental disorder in the fifth edition of the American Diagnostic and Statistical Manual of Psychiatry. There are more boys with autism than girls, with a ratio of about 4:1.
The number of children with autism in the United States has increased more than 150 times in the past 40 years. In March 2014, the US Centers for Disease Control and Prevention published a statistical report that one in every 68 newborn babies in the United States is autistic; the chance of a boy is 1 :42, and the girl is 1:189.
Causes of Autism
Scientific research in the United States in recent years has pointed out that autism is not a single but has multiple causes, including:
- Rare genetic variation
- Biochemical function development disorders
- Environmental factors
- Mother infected with a virus during pregnancy
Any combination can trigger the emergence of autism: Environmental factors mainly include: Older parents, heavy metal pollution, immune system, antibiotics, food allergies, environmental pollution, illness during pregnancy, and the dangers caused by production.
Studies have shown that simple environmental factors do not directly lead to autism, only when a combination of high-risk genetics and environmental factors can lead to the emergence of autism. Studies have also confirmed that autism has nothing to do with mental disorders or parenting styles.
Symptoms of Autism
A. Children with autism usually have the following three basic characteristics before the age of three:
- Social development barriers – Children live in their own solitude, few friends, not good at observing words, not knowing where to go;
- Communication barriers – Spoken language development is slow, often using rigid, repetitive or parrot-style speech
- Repetitive and limited behavior patterns – often adhere to certain ways of doing things, such as taking a bus or a specific seat on a certain route, and refusing to change the habits of daily life.
B. Children with autism may also have the following related characteristics:
- Special perception mode
- Overall development barriers
- emotional and behavioral difficulties
- Abnormal lifestyles such as eating and sleeping
- Lack of ability to experience the thoughts and feelings of others
- Special strengths and interests
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