Baby started refusing the breast

👱🏻‍♀️

She’s 11 weeks and has always been given the breast and formula. Recently tho she’s been extremely fussy at the boob and will only last like 3 mins on each side and then pull off and scream.

I did have to slow down with breastfeeding cause I went back to work one night a week, but I feel like that wouldn’t affect her so much.

Any ideas of why this could be happening?