Let him watch you poop. Exaggerate the pushing sound and expression on your face and then once you get it out show relief. Let him see the poop in the toilet and YOU flush it down. My son loves to flush the toilet, especially poop since it’s solid and much cooler to watch go down than just liquid. So because it was my poop, I got to flush it. I told him if he pooped, he could flush it. We did start with watching videos on my phone on the toilet just to get him to sit long enough but eventually we moved to books.
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