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The percentage of infants admitted to a neonatal intensive care unit (NICU) in the United States rose 13% from 2016 to 2023, from 8.7% to 9.8%. Increases from 2016 to 2023 were seen for all maternal age, race and Hispanic origin groups, gestational age and birthweight categories and in 40 states.
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Martin et al. (2025) studied this question.