I feel so anxious. I am sure that my health visitor told me to start giving my LO Vitamin D drops once she went under 600ml of formula a day. She has been taken round about 600ml or just under for the past two months, so I started giving her a a daily drop. I have just read on the NHS website that you are only supposed to give them once they go under 500ml. Will my baby be ok, or have I done any damage?