My baby has to be on special formula so I get 11 cans a month of it through her insurance, plus she gets some breast milk. She's only 4 months so the formula we get is more than enough right now. But I was wondering if I weaned her off of breast milk when she's a little older, and just gave her formula, how much I'd end up buying a month in addition to the 11 cans from her insurance? How old is your baby, and how many cans a month do you use?