Developmental delay refers to the slowdown or abnormal sequence in the process of growth and development. 5 months old babies with developmental delay mainly show that they can’t roll over, their height is less than 60 centimeters, their weight is less than 7 kilograms, they can’t laugh, they can’t roll over, they can’t grab things, they can’t “recognize people”, and they can’t even hold their heads up. Parents should promptly take their baby to the hospital to clarify the cause of the developmental delay, there are many reasons for the developmental delay of 5-month-old babies, which may be caused by congenital genetic factors, or may be caused by acquired malnutrition, it is recommended to actively treat the original disease, strengthen the diet and nutrition, and promote the baby’s development. 1. congenital genetics: normal growth variants, such as familial short stature, physical developmental delay, low birth weight dwarfism, mainly related to congenital genetic factors, uterus, and the development of the baby. Mainly related to congenital genetic factors, intrauterine dysplasia, the baby’s growth rate is slower than that of children of the same age, but generally does not require special treatment. However, if the growth is delayed due to genetic diseases such as osteochondrodysplasia, congenital hypothyroidism, or growth hormone deficiency, the baby needs to seek medical attention in a timely manner to identify the specific cause and undergo systematic treatment. For example, for growth hormone deficiency, growth hormone replacement therapy is mainly used, and congenital hypothyroidism can be treated with levothyroxine sodium; 2. Acquired factors: mainly caused by malnutrition, such as improper feeding, or infants with long-term diarrhea, respiratory infections and other diseases, resulting in malnutrition absorption, the intake of nutrients is lower than the amount needed by the body, which leads to baby Growth retardation. This can be alleviated by supplementing with trace elements such as calcium, iron, zinc and vitamins. At the same time, it is important to ensure the intake of adequate nutrition, such as breast milk is not enough to add appropriate milk powder, the disease caused by malnutrition need to treat the original disease.