This is happening to me ! My little boy is 14 weeks and he suddenly started refusing the boob. He won’t even latch on anymore.
My LB is 3 months old and he has been doing this sporadically for the past couple of weeks. He is usually fine after a couple of days. I try to have skin to skin contact and make sure he is not gassy. Sometimes he latches if using a shield, I think it is easier for them so I try both with and without. Whatever works!!
My friend had a bath with her baby which fixed it