Consequences of Maternal Vitamin D Deficiency on Newborn Health: Taking into consideration that vitamin D deficiency has been correlated with many complications, both in maternal and newborn health, a serum level determination of 25-(OH)D is necessary in the first trimester of pregnancy, and after that, adequate supplementation is necessary in order to prevent any negative effects https://www.mdpi.com/2075-1729/14/6/714 Die Ergebnisse deuten darauf hin, daß eine Vitamin-D-Ergänzung während der Schwangerschaft eher zu termingerechten Geburten als zu Frühgeburten beiträgt.