Baby fights his bottle

my 4 month old regularly fights his bottle. its been going on for a while now. just wondered if anyone else was going through this.  when i go to feed him a bottle he'll push it away with his hands so i hold his hands down. then the tries to move his head/mouth away from it like he's mad at it and doesn't want it.  but once he latches onto he sometimes will start drinking it and drink the whole thing without a fight and he sometimes won't so i let it go and try again. and often he'll go for it even 1/2 hour later even though he absolutely refused it a 1/2 hour before!  sometimes it seems like he just realized that he IS hungry for it- like rooting for it really fast.  i don't know if he's just confused? or maybe he would rather be looking around/playing than eating?  i don't know.  but he'll do this all day long and then at night he's ready to get to business and eats a lot right before bed... maybe finally hungry after a day of fighting it?  For example today i nursed him before work. he probably got 4 ounces of breastmilk from me.  he has been at daycare since 7:45 this morning.  i called at 2:30 and he has only eaten 6 ounces so far and i'll bet that's all he'll take there today when i pick him up at 4:45.  doesn't seem like enough. 10 ounces in 11 hours?  he is gaining weight good. he's chubby!  is anyone else going through this?

i have not changed anything (bottles, nipples, formula, etc).  he is teething but this behavior has been going on for a long time.  i changed to faster flow nipples a while ago and that did seem to help.  maybe i need to move up to the fastest ones already? but he's only 4 months old...