Extrauterine growth restriction (EUGR), a serious risk that potentially impairs the growth of preterm infants after birth and during childhood, triggers a thought of how to achieve optimal catch-up growth during hospitalization.We aimed to access the incidence of optimal catch-up growth in small-for-gestational-age (SGA), appropriate-for-gestational age (AGA) and large-for-gestational-age (LGA) infants, and identify the factors for optimal catch-up growth in preterm infants during hospitalization. Premature infants admitted to Shanghai Children’s Medical Center within 24 hours after birth from January 1,2016 to December 31, 2018 were enrolled. Prenatal, neonatal etiological, and nutrition data were collected and analyzed to identify factors associated with optimal catch-up growth during hospitalization. 105 (9.9%) of 1065 preterm newborns achieved predischarge optimal catch-up growth, including 27 (17.2%) of 157 SGA, 74 (8.5%) of 868 AGA, and 4 (10.0%) of 40 LGA infants. Logistic regression analysis indicated SGA, avoiding BPD and less days to regain birth weight as the contributing factors of optimal catch-up growth during hospitalization.Conclusion: SGA infants showed greater potential in predischarge optimal catch-up growth. Early abundant nutrition and avoiding BPD are essential for achieving optimal catch-up growth during hospitalization.
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