Whether the developmental delay will be normal when it grows up needs to be analyzed according to the degree of delay, the cause and the timing of treatment. If it is caused by malnutrition, the child’s growth and development will be significantly improved after giving adjustments. If it is caused by genetic factors, the long-term prognosis will be judged according to the symptoms, which will be more complicated, and the treatment will be tailored to the symptoms, and then the long-term prognosis will be judged according to the specific situation. If the developmental delay is caused by some pathological factors, such as chromosomal diseases, metabolic diseases, osteochondrodysplasia, congenital hypothyroidism and other diseases, the developmental delay will be improved after the primary disease is controlled. If the developmental delay is caused by brain injury, the course of treatment will be longer, and it may not be able to recover. If the developmental delay is not treated in a timely manner, the condition will become more and more serious. Therefore, developmental delay requires timely medical attention and may require rehabilitation to promote the child’s overall developmental level, as well as regular checkups and dynamic observation of the child’s development.