This review summarises the present knowledge of nutrition for infants. Breastfeeding and mother's own milk is recommended for both term and preterm born infants. Much research has been centred on providing optimal nutrition in very preterm infants to improve both their short- and long-term outcomes. Growth charts are very important for all those taking care of and treating both term and preterm born infants. In very preterm infants, the optimal growth velocity remains uncertain. Growth failure is harmful, but rapid weight gain may be harmful as well. Growth can in both term and preterm born infants be evaluated by using WHO growth standards 2006 and 2017.