 It is standard care in the Netherlands for all premature born infants under 32 weeks to get seen by the paediatrician at the age of two years for a check on growth and development. The visit to the day care clinic of the hospital of their admission on birth, enables us to collect qualitative data on growth and physiological development as well as from psychological and neurodevelopmental standardised tests.The collected data enables us to gain a better description of the subjects in our study and to further determine safety of the studied drugs. 