Yay! congrats on making it this long!!
DD's pedi said she should get at least 12-16oz a day. She didn't say a max, but she did say not to let her drink "too much". Before I weaned, DD was nursing once when she woke up, 2 bottles of 4.5oz of EBM at daycare, and nursing once before bed. Her pedi said that since she was already around 4oz that would make it an easy transition. Basically those bottles/nursing sessions would be replaced with whole milk.
This is what I did: I started offering her some whole milk at dinner. I wanted to make sure she didn't have a reaction. My supply was plummeting so I also wanted to make sure she was getting enough to drink. She took straight whole milk fine.
So I started mixing in whole milk with her EBM bottles. I was running low on my freezer stash so I started around 3 weeks before she turned 1. I increased the proportion of milk each week until we were at all whole milk at a year.
As far as the nursing sessions...on the weekend I started offering sippy cups of milk instead of nursing during the day. I think I would give her water at lunch and then milk at snack time. About a week later (11.5 months), I dropped the before bed session. I had no supply at that point, so it was easy. I gave her a sippy of milk before bed. At a year, I dropped the morning session and offered a sippy of milk.
In the beginning she only took a couple ounces at a time, but now she can take up to about 4oz. I think she probably gets about 16oz a day. And during the weaning process, I basically replaced nursing/bottles with sippy cups of milk. But as we got past weaning, I started offering milk sippy cups at meal time/snack time, and water at other times.
Sorry so long!