Common indications for parenteral nutrition include the following: 1. Children who cannot be fed through the intestinal tract, such as newborns with very low weight or super low weight, including some preterm infants with small gestational age, are more common in clinical practice. Generally newborns born before 34 weeks of gestation do not suck, such children do not have the function of sucking, so feeding through the mouth is relatively difficult. In this case, feeding through a nasal feeding tube, i.e., through a lower gastric tube, is clinically necessary. In the process of feeding, because of the immature development of the intestinal function of the child, part of the nutrition still needs to be given to the child parenterally; 2, children with some common intestinal diseases, such as intestinal obstruction, intestinal atresia, necrotizing small intestine colitis, and even anal atresia, need to be given parenteral nutrition within a period of time after surgery; 3, if the child has other serious lesions in the intestine, such as intestinal necrosis If the child has other serious intestinal lesions, such as intestinal necrosis, parenteral nutrition may also be required.