Eating Regression? So my son (21 weeks old) seems to have recently decided to go on some type of…

Eating Regression?

So my son (21 weeks old) seems to have recently decided to go on some type of hunger strike...all kidding aside, he's barely eating 3 oz every 4 hours. He was eating 4 oz every 2.5-3 hours, however now just screams and cries whenever we try to give him a bottle. I am a little concerned because he's already on the smaller side since he was born early- only weighed 11lbs 9oz at his 4 month appt. I think some of it may be do to teething (he's been chewing on his fingers, being more fussy, drooling constantly) but as a FTM, I don't know much about this stuff. Is anyone else going through this or heard of this before? Thanks!!