My LO has been bottle fed from birth, she was 6 weeks early and has always been an excellent feeder until she reached 4 1/2 months (3 mo gestationally) and now is really really fussy and it's a struggle to even get her to have half her bottle, she's on anti reflux formula and has been for a couple of months. I don't understand the change and I'm not sure what to do from here. Can anyone help???