Fighting bottle and biting nipple?

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So yesterday my LO (17 weeks) started fighting just the sight of the bottle. I put him in my arms to feed him and he starts wailing. I try for little bit, but he bites the nipple and shakes his head. What the heck is going on? Eventually after trying for awhile (if I know he's hungry), he'll take it. At the end of the day he's eating about 3 oz less, so I'm not panicking.

Teething? Too slow flow nipple size? Both? Idk help for this tired FTM 😩