Abstract: With the development of perinatal medicine and the establishment of the neonatal intensive care unit, the birth rate and survival rate of premature infants have increased significantly. However, because premature infants are susceptible to various premature related diseases due to their immature tissues and organs, in addition to possible issues such as insufficient energy and nutrition intake, the incidence of extrauterine growth restriction in premature babies is high. Extrauterine growth restriction is not only closely related to the growth and development of premature infants and the outcome of the disease, but also leads to long-term adverse outcomes such as dysplasia of the nervous system and metabolic syndrome in adulthood. This article reviews the research progress of extrauterine growth restriction in premature infants.

Key words: extrauterine growth restriction; growth evaluation; preterm infants