* Trigger warning **
So I recently have been mixing my sons milk ( Alimentum ) with whole milk. Since he is 11 months the doctor told me to give it a try. He was doing perfectly fine at first and today his poop has been coming out kinda like play doh but then just right now he popped like this and he hasn't had the black in his poop until now , does anyone know what this could be or what could be wrong?