Baby doesn't want to nurse anymore...

LaRue • First time mom to Violet💖 April 24th 2017! 👶🏼

Baby is 4 months and has been nursing pretty well until about a week ago, she has no interest in the boob anymore. BUT when I tried just giving her formula she got super cranky because she wasn't getting the mommy and baby bonding time.

I'm feeling soooo frustrated.

Any ideas what changed???