The performance of children with developmental delay is actually divided into several categories of parts: 1, growth and development, that is, the usual physical development, that is, height, weight and other aspects of developmental delay, such as height does not grow as fast as others or weight is too thin; 2, nutritional reasons or the child has special diseases resulting in slower growth and development; 3, mental retardation, such children are congenital or in the process of development after birth In the process of development, there are factors that affect the child’s nervous system; 4, some children are motor development delay, which is related to the child’s early motor education, family life management, or congenital problems. In conclusion, there are multiple causes of developmental delay, and differential diagnosis is needed.