at the time of my daughter's birth a pediatrician said to use vitamin d3 drops daily 0.5 ml one in whole day. another pediatrician saying to give 1 ml dose 0.5 morning and event.. on the vitamin d3 carton it's given each 0.5 ml contains 400 iu. plz guide should I be giving her 0.5 ml or 1 ml daily?????