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Aim  This study assessed whether increased amino acid and energy intake in preterm infants during the first week of life was associated with improved neurodevelopment at the corrected age ( CA ) of 24 months.    Methods  We evaluated preterm infants from two consecutive cohorts in 2004 (Cohort 1) and 2005 (Cohort 2) with different nutritional intakes in the Netherlands. Nutritional intake and growth were recorded until week 5 and after discharge. Neurodevelopment was determined using the Bayley Scales of Infant Development – Second Edition at a  CA  of 24 months.    Results  Compared to Cohort 1 (n = 56), Cohort 2 (n = 56) received higher nutritional intake during week 1 (p < 0.001). The weight gain in Cohort 2 was higher until week 5, especially among boys (p < 0.002). The mean Mental Developmental Index ( MDI ) scores did not differ, but Cohort 2 was associated with an increased chance of having an  MDI  ≥ 85, with an odds ratio of 6.4 and 95% confidence interval ( CI ) of 1.5–27.4, among all girls with a higher protein intake (5.3, 1.2–23.3). The Psychomotor Developmental Index increased with increasing nutritional intake, especially among boys ( β ‐coefficient 3.1, 95%  CI  0.2–6.0).    Conclusion  Higher nutritional intake was associated with different improvements in growth and neurodevelopment in boys and girls.

The early postnatal nutritional intake of preterm infants affected neurodevelopmental outcomes differently in boys and girls at 24 months