The age at which mild developmental delay can be normal needs to be analyzed on a case-by-case basis. Developmental delay refers to the process of growth and development, due to many factors affecting growth and development, resulting in a slowdown in the growth of children, or abnormal sequence. If it is a transient mild developmental delay, the prognosis is good and can be completely restored to normal through appropriate treatment. If the developmental delay is caused by genetic factors, the prognosis needs to be judged according to the symptoms, and the situation is relatively complicated, and the recovery effect also depends on the treatment. In the case of mild developmental delay caused by brain injury, the treatment process is relatively long and may not even recover. Children with mild developmental delay can enhance their diet and nutrition, consume fresh fruits and vegetables, and strengthen physical activity.