The interval between feedings for preterm infants depends on breastfeeding as well as artificial feeding. The recommended individualized principle is that breastfeeding should be done on demand, with a feeding interval of 2-3 hours. In case of underfeeding, poor sucking ability of children in general, or feeding intolerance, small amount of multiple feedings can be done both during the day and night. In terms of feeding methods, the decision is made according to the specific circumstances of the preterm child. If the child has a higher birth weight and is of a higher gestational age, and has a better sucking ability, he or she can suck directly on the breast. If this child is heavier and has the ability to suck, but is more tired of sucking breast milk, you can bottle feed, the milk should pay attention to the temperature, the nipple should be softer, this hole should not be too big, to drip out the milk, if the flow is too fast, it may easily cause choking and coughing, the flow of milk is too slow, the child sucking is more laborious, and may easily become tired and refuse milk. For children with poor sucking ability and relatively small weight, they can be given gastric tube feeding. For children with digestive tract deformities or children who cannot be fed temporarily after surgery, or children with serious diseases with insufficient intake, parenteral intravenous nutrition can be used. Feeding premature children is best done with breast milk, and breastfeeding should be encouraged as much as possible, and in the case of insufficient breast milk, formula feeding for premature babies can be used.