Stringy/mucous baby poop?

An

Just noticed my two month old had stringy poop. He is formula fed. Milk protein allergy is out the question cause he is already on a hypoallergenic formula. I’m calling his doc tomorrow but any idea why it is stringy? Keep in mind he also cries.... a lot. Like 24/7 not exaggerating. I have been to the doctor multiple times about the crying because I feel like it’s not normal.