* Due to the increased risk of brain damage, continuous monitoring of the cerebral oxygenation is interesting. The investigators will evaluate the capability of the INVOS Oximeter to detect induced changes in the cerebral regional saturation. * The purpose of the study is to investigate our hypothesis that cerebral vasoconstriction after oxygen exposure is prolonged in preterm infants compared to term infants.
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Changes from baseline of cerebral oxygen saturation after oxygen exposure.
Timeframe: Measurements will take between 30 minutes and 3 hours depending of situation. Measurements within the first 4 weeks of life. No follow-up.