1. Definition and characteristics of milk powder for low-birth-weight infants Milk powder for low-birth-weight infants is a formula specially designed for infants weighing less than 2.5 kilograms at birth. Compared with ordinary formula milk powder, it has higher energy density and nutrient content to meet the growth and development needs of low-weight infants. 2. Applicable groups of milk powder for low-weight infants Milk powder for low-weight infants is suitable for newborns whose birth weight is less than 2.5 kilograms, especially premature infants and premature infants with a gestational age of less than 37 weeks. These babies are unable to fully develop in their mothers and have poor body functions.