My 8mo is healthy little guy who loves his food. We do a 4hr EAS (4 bottles of formula plus 3 meals). When do I start removing a bottle feed?
Often when A times extend and naps are good the E naturally extends to beyond 4hrs, it is easier for them to go longer between the milk feeds because of the solids meals between too.
You can continue with the 4 bottles for a few months yet. Eventually you might see less interest in one or more milk feeds (maybe 10 months?) and at that point you can switch 1 milk feed for a solids snack with cup of water and continue with 3 milk, 3 meals and 1 snack for a while.
After that you can switch another bottle for a solids snack with water making 2 milk feeds, 3 solids meals, 2 snacks.
When I switched a milk feed for a solids snack I left it at exactly the same time I would have done the milk feed - so easy that way, both you and LO are expecting an E time and you just change what you offer.
The WU and BT milk can remain long after turning 1yo although it's advised to drop bottles at 1yo - but they still need milk/dairy so many people keep 1 or 2 milk feeds with a bottle if LO isn't ready to take a good milk drink in a cup yet.
hope that helps