Newborns born at full term grow 2-3 pounds at full term, which is a relatively normal and common phenomenon. If the weight grows too little, the more common reasons are: a. Inadequate feeding, inadequate feeding has insufficient breastfeeding and formula feeding two situations. Insufficient breastfeeding is mainly caused by insufficient breast milk secretion, some parents do not know whether their breast milk secretion is enough, but the weight gain is not satisfactory, it is an indirect reaction to insufficient breast milk, it is recommended to match the formula and ask the help of a lactation consultant for treatment. If the child has diarrhea or disease, it is recommended to ask a neonatologist to help treat it. If a child is born prematurely or has a disease, the child will have a low weight gain at full term, so it is necessary to ask a neonatologist to help analyze whether the growth is normal.