milk intolerance?

Hi! The pedi is having me cut dairy out of my diet because I told her I think DS has mucus in his diaper, however she has not seen one of his diapers for herself yet. I can''t tell if there is mucus or if he has normal breastfed poop. It looks normal but if I rub both sides of the diaper together, the sides kind of stick to each other like clear strings. I am just confused because his diapers do not look like the mucousy diapers on the internet. I am going to show her his diaper at his next appointment. Any opinions on what I described? If anyone is feeling brave, let me know if there are clear strings that stick together when you rub the diaper together.