I live in France, and we have been told to give our baby 3 droplets of a vitamin D supplement that amounts to 3x330 IU = 1000IU. The baby formula amounts (hopefully I did not mix up units) to roughly 400IU, so in total 1400IU. I've read on US websites that the daily needs for a baby of this age are 400IU of Vitamin D.
The baby does not have any special deficiency or nothing, and I have talked to the pediatrician: giving Vitamin D supplements to any baby seems to be the standard guideline in France (independently on bottle or breastfeeding).
Am I overlooking something (different units in US than in France, different type of measurement... don't know) or is the French guideline really by a factor > 3 higher than the US one? Is it harmful to give such a high dose? Where does this large difference in the guidelines stem from?
Thank you in advance.
Reference: The supplement leaflet makes reference to this governmental text from 1971: Prévention du rachitisme. Circulaires de la Direction générale de la Santé du 21 février 1963 et du 6 janvier1971(extraits)