Week 3 changes?

FairyDuster003

DD has been a great eater from the start. I struggled with raw nipples like expected and with your encouragement I have stuck it out and seen much improvement! It has been getting easier until the past couple days. She will nurse great for about 15 minutes or so then she starts pulling away while latched! Sometimes she will start crying and unlatch then frantically try to relatch and again tug and squirm and scrunch up her legs. Just really fussy and what looks to be frustration or gas!

I still have plenty of milk coming out, I burp her often, and she seems to poop just fine although sometimes I help her when she seems gassy. But even after a burp and poop, she still seems fussy at the boob! I can't figure out what the problem is. Any idea what could be causing this behavior??