u/AlgaeOld5220

Looking for some remedies for a 22 month old withholding bowel movements. My son decided he wanted to potty train and immediately got the hang of going pee and had a couple accidents with going poop. He eventually went in the toilet and now it has been two days and he is seemingly petrified to go again. He is clearly uncomfortable and I want to help him. He has the timing right because he starts to let a very small amount out and runs to the toilet but then refuses to go.

Looking for anything safe to help him out.