Hi, M., One thing I haven't seen mentioned is the clean-up effort. He's not too young to clean up his mess(walls,playhouse, etc.) Of course, he can't do a great job, but the task of cleaning---without any fussing from you, just direction-- will be a lesson. I do this with my granddaughter, and it works very well. "Oh, you made a mess. Now you have to clean it up. Here's a rag, wipe it off, you missed a spot, etc." That goes for spit, juice, crayolas, anything that is deliberate. It teaches responsibility, and takes the stress out of it for you. Poop isn't yucky to kids, it's just a curiosity with something new. Good luck---we've all been there!