Anyone elses baby go through days they dont eat much?

Jenna

My little guy is 16 weeks and every once in a while he has a day where it’s almost like his tummy his bothering him and barely eats. Hes acting totally fine playing laughing wet diapers but really wont take the breastmilk. We did fine out he had food induced infant colitis so that could definitely be it, but it stresses me out!!