PREDIN: Pregnancy and Vitamin D Intervention Study

At a routine visit at the antenatal care in early pregnancy (gestational week \<15) women will be provided with with vitamin D3 (cholecalciferol) supplements. Two tablets, with a total content of 20 µg (800 IE), are taken daily throughout pregnancy.

At a routine visit at the antenatal care in early pregnancy (gestational week \<15) women will be provided with with vitamin D3 (cholecalciferol) supplements. Two tablets, with a total content of 40 µg (1600 IE), are taken daily throughout pregnancy.

In early pregnancy (gestational week \<15) women are advised by the regular midwife to take a daily supplement of Vitamin D throughout pregnancy, according to usual antenatal care routines.