If a newborn’s weight does not change in the first month of life, it is necessary to judge whether it is normal according to other symptoms, relevant examinations, etc. If the weight does not increase continuously, it should be considered that there is a disease or nutritional deficiencies and other reasons. After the birth of newborns due to the loss of body water, milk intake is insufficient, meconium discharge and other factors, there will be a temporary physiological weight loss, most of the 7 ~ 10 days to return to normal weight, weight loss of more than 10% of the birth or 10 days after the weight does not return to normal weight, for the pathological state, need to consider the cause. Newborns grow faster in the first three months after birth, no change in weight in the first month of life suspected disease or nutritional deficiencies and other causes, need to go to the hospital for a clear diagnosis, timely treatment.