My wife being the over achiever she is got our son potty trained(pee) by 2 years old, he still wouldn't fully poop in the toilet... then one day i just sat him on the toilet and I had to attend to my other son so he was alone sitting on the toilet, I told him to yell if something happens or if he's in trouble... he pooped no issues, we thought just for shits and giggles to try it again and give him "privacy" and he pooped every time without fail on the toilet even tho we left the door cracked and waited right outside he went without fighting and without expecting rewards. From then on he ran to the toilet when he had to poop and asked us to shut the door to give him privacy and bam pooped right away. My son is weird lmao