There is no magic age just when your child is showing signs of being ready.
Is coordinated enough to walk, and even run, steadily.
Urinates a fair amount at one time.
Has regular, well-formed bowel movements at relatively predictable times.
Has "dry" periods of at least two hours or during naps, which shows that his bladder muscles are developed enough to hold urine.
Can sit down quietly in one position for two to five minutes.
Can pull his pants up and down.
Dislikes the feeling of wearing a wet or dirty diaper.
Shows interest in others' bathroom habits (wants to watch you go to the bathroom or wear underwear).
Gives a physical or verbal sign when he's having a bowel movement such as grunting, squatting, or telling you.
Demonstrates a desire for independence.
Takes pride in his accomplishments.
Isn't resistant to learning to use the toilet.
Is in a generally cooperative stage, not a negative or contrary one.
Understands the physical signals that mean he has to go and can tell you before it happens or even hold it until he has time to get to the potty.
Can follow simple instructions, such as "go get the toy."
Understands the value of putting things where they belong.