Breastmilk handling routines for preterm infants in Sweden: a national cross-sectional study.

Background: In Sweden preterm infants born <32 gestational weeks are fed maternal breastmilk or, if not available, donor breastmilk. Nutritional and immunological composition of human milk is affected by processing and storage procedures. Additionally, freezing of breastmilk may reduce cytomegalovirus transmission.