My DD is 5 1/2 weeks old. We formula feed her. She has been almost constantly fussing at the bottle for the past 3 weeks or so. She will drink for less than a minute before pulling back and crying, super red in the face, while kicking her legs or pushing back with her legs. We pull the bottle out of her mouth and try and put it back in. Sometimes she still cries, sometimes she takes the bottle back and eats. Rinse and repeat.
I try to burp her every 2 ounces, which is half way through the bottle since she takes about 4 ounces each feeding. Sometimes she doesn't burp, she's a horrible burper. Especially at night, we swaddle her and leave her swaddled since she doesn't poop in the middle of the night, and almost always never get a burp out of her.
She usually only spits up at night, but not every time. Hardly does it during the day. When I told the pedi this, she thought maybe she was swallowing the spit up. We also give her gas drops after every feeding, and sometimes in between because of the fussiness.
She makes a lot of noise at night, lots of grunting and throat clearing noises. I'm not sure if it's because of acid coming up, or because she is swaddled and is trying to get to her hands. We have her in a RNP because of the angle at night and also during the day.
She was BF the first 3 weeks while also supplementing because she was losing weight. We had her on Similac for supplementation, but she would poop that out in less than a minute of having it. So we switched her to Similac Sensitive. She did much better on that, but still super fussy while eating.
When I went to the pedi with my concerns of reflux, she put her on Prevacid twice daily. That was a week ago as nothing has changed. We also switched formula to Enfamil with Added Rice Cereal. Also no change.
Could this be gas and not reflux?? I wonder if it is more gas because she seems to do better the second half of the bottle. We just don't know what is going on, and feel like the things we are doing are not working.

Congrats to anyone who read all of that, and I really appreciate your help!
Re: Reflux or Gas??
My little one also sleeps in a RNP because of her spitting up.
DS gets really fussy if it's not coming fast enough. He was also a horrible burper at that age. Their throat is still immature at that point and it took him a couple weeks to grow and get it sorted. Now he's fine except he's laying on me passed out not burping tonight.
Just a thought.