Preterm babies can not be generalized, its growth is related to the specific gestational age and health conditions, need to correct the gestational age to judge. Generally speaking, preterm infants to correct the gestational age to reach 40 weeks later, and then pay attention to its weight and other growth and development of the situation is up to standard, in the case of adequate feeding, nutrition and health status, preterm infants can be half a month to a month or so to return to the normal level of birth, and then in accordance with the standards of newborn infants and young children, before the first few months of rapid growth, can reach 1kg / month or so. Preterm and newborn length and weight and other factors affecting more, if there is lactose intolerance, milk powder allergy and other conditions, resulting in poor digestion, absorption and feeding nutritional status and other conditions, the baby’s weight growth will slow down. It is recommended that the specific one-month weight gain of preterm babies should be based on their own actual situation, ask the doctor to make a judgment, and take timely and appropriate interventions when there is an abnormality.