Middle of the night bottle

My 10 month old still wakes up at approx 2-3 am every night for a bottle. He’s been on formula for the last 3 months(BM before) in addition to solids from 4 months(just for fun) he still has bottles every 4 hours meeting his recommended intake daily plus some sometimes so it’s not a calorie deficit issue. I’ve tried just rocking and putting back and also just trying to give him water in a bottle in case it was just a soothing thing but it seems it’s a formula thing. He has a Dr appt on Thursday and I will be asking but any ideas on how to transition out of this or what age they typically transition?