Question: how do you know whether a child is ready to start learning to use the toilet?
Answer: Pulling at a wet or dirty diaper.
Hiding to pee or poop.
Interest in others' use of the potty, or copying their behavior.
Having a dry diaper for a longer-than-usual time.
Awakening dry from a nap.
Telling you that they're about to go, are going or have just gone in their diaper.