BACKGROUND: The association between human milk (HM) feeding in the NICU and neurodevelopmental (ND) outcome in very low birth weight (VLBW) infants is unclear. Limitations of previous studies include a lack of exact estimates of HM dose and of generalizability to minority populations. OBJECTIVE: To determine the impact on ND outcome of an exact dose of HM received in the NICU in a diverse, contemporary cohort of VLBW infants. METHODS: We included 430 VLBW infants born in the period 2008-2012 for whom the mean daily dose (DD) of HM received during the stay in the NICU (NICU HM-DD) was calculated prospectively from the daily nutritional intake from admission to discharge. Outcomes included Bayley-III index scores at 20 months' corrected age (CA) as assessed upon ND follow-up, which were collected retrospectively. Multivariable linear regression analyses controlled for neonatal and social risk factors. RESULTS: Each 10 mL/kg/day increase in NICU HM-DD was associated with a 0.35 increase in cognitive index score (95% CI [0.03-0.66], p = 0.03), but no significant associations were detected for the language or motor indices. CONCLUSIONS: There is a significant dose-dependent association between NICU HM intake and cognitive scores at 20 months' CA. Further follow-up will determine whether these findings persist at school age, and could help alleviate the special-education and health-care burden in this population.
BACKGROUND: The association between human milk (HM) feeding in the NICU and neurodevelopmental (ND) outcome in very low birth weight (VLBW) infants is unclear. Limitations of previous studies include a lack of exact estimates of HM dose and of generalizability to minority populations. OBJECTIVE: To determine the impact on ND outcome of an exact dose of HM received in the NICU in a diverse, contemporary cohort of VLBW infants. METHODS: We included 430 VLBW infants born in the period 2008-2012 for whom the mean daily dose (DD) of HM received during the stay in the NICU (NICU HM-DD) was calculated prospectively from the daily nutritional intake from admission to discharge. Outcomes included Bayley-III index scores at 20 months' corrected age (CA) as assessed upon ND follow-up, which were collected retrospectively. Multivariable linear regression analyses controlled for neonatal and social risk factors. RESULTS: Each 10 mL/kg/day increase in NICU HM-DD was associated with a 0.35 increase in cognitive index score (95% CI [0.03-0.66], p = 0.03), but no significant associations were detected for the language or motor indices. CONCLUSIONS: There is a significant dose-dependent association between NICU HM intake and cognitive scores at 20 months' CA. Further follow-up will determine whether these findings persist at school age, and could help alleviate the special-education and health-care burden in this population.
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