I know the advice is is baby is having less than 500ml a day, they should take vitamins. The amount my son has in day, if he finishes every bottle, is exactly 500ml. However some days he finishes them all, some days he'll leave a good few oz in all of them. So some days, he's below and some days he's on the threshold. I know they can have too much vitamin A, which is why they advise the 5000ml thing. Just not sure what to do? Whether to put him on Abidec or not? After reading possible covid link to vitamin D defiency I don't want him to be lacking in anything.