This invention relates to the use of a nutritional composition comprising Fut2-dependent oligosaccharides for promoting brain growth and development in infants in the very early postnatal period. The nutritional composition comprises Fut2-dependent oligosaccharides and Lacto-N-neotetraose and is specifically for use in promoting brain catch-up growth in preterm infants or infants with low-birth weight. The invention further relates to a kit comprising at least two of these nutritional compositions.