Baby not as interested in the bottle

So my baby is 8 and a half months old and formula fed, kid loves his milk, but yesterday and today he just isn’t as interested in his bottles, he typically has 5 or 6 bottles a day with 5oz in each and yesterday I managed to get 3 full ones down him and then half of another

He is teething so I’m not sure if that’s what made him go off of it but he woke up teething last night and where he would usually be hungry as anything for his bottle I only managed to get a yogurt down him, I’ve tried the bottle cold, still nothing, he just pushes it away or chews the bottle, same thing with this morning, not had a bottle in 10 hours and it was a struggle to get him to finish it

Just wondering if this is happening to any one else and whether it’s normal at this age to drop his formula amount or maybe just a phase 😂