Weaning off the bottle? Update

At what age did you start weaning baby off the bottle? We’ve gotten down to 2 bottles a day, been working our way down from like 7-8 a day since he started solids at 6mo, now it’s just one at nap time & one at bedtime. It is pretty much the only way to get him to sleep without an insane meltdown. He is 10mo so I don’t expect to do it til at least 12 but I’m super nervous because I have no idea how to transition him to not need it to go to bed. I’m also worried that without it he wouldn’t sleep as long, he’s a 12-13h sleeper a night. Any tips?

UPDATE:

I totally forgot to mention he is on hypoallergenic formula, he can not have milk or soy, so idk what I am supposed to give him in replacement. 🤦🏼‍♀️