My LO does this. She sleeps in a rock and play to keep her head up. After each feeding she burps and sits up right for 20-30mins. It's exhausting but try to keep her upright for at least 20mins after each feeding. Reflux is rough. Mention it to her pediatrician, they had some good advice and watched my LOs weight gain more closely

My son does the same thing, try to hold her up right for about 30 minutes after that first feeding. Go walk around or do something different. She may let out a burp, then offer food again and she may not want it.

Both mine did the same. I didn't BF they had formula from the start. I switched their formula to the gentlease soy and it helped a lot!!

Totally normal and exhausting lol