Children with mild mental retardation can improve significantly later through special rehabilitation treatment and usually do not grow up to be stupid. Mental retardation can be caused by the presence of high-risk factors before, during or after birth, such as prematurity, low birth weight, or with genetic metabolic diseases and chromosomal disorders. Mental retardation is classified as mild, moderate, severe, or very severe. Mild mental retardation is defined as having an IQ of 55-75, also known as stupidity, a delay in intellectual development compared to normal children, a lack of interest in surrounding things, slightly delayed language development, poor overall analytical ability, and poor adaptability to the outside world. However, mild mental retardation is educable and can be improved after active intervention to achieve a certain level of reading and calculating, and will not be mentally retarded when they grow up. The brain is very plastic during childhood, so people with mild mental retardation should actively intervene, such as acupuncture, physical therapy, language training, fine motor training, whole brain development and other comprehensive rehabilitation treatments.