it depends, my baby's max milk intake for a meal at 6 months old

was 4 oz of milk. So 4 oz of liquid is a full stomach for her and it is taking a lot of space; even if you spread the total volume throughout of the day.

Of course as there are baby juices on the market, there must be parents and doctors think that it is perfectly fine to feed 4 oz juice to a baby. I am only saying I am not one of them and I don't give juice to my baby, or anything else that is particularly sweet. In fact even my 4 year old does not drink a lot of juice. Usually a cup of good juice (no added sugar, not from concentrate) per day is the max she will get, and she is fine with that.