First of all: The child must be ready! Don’t force it. Don’t even try if you have not met certain conditions. At the physiological level, the nervous system, which controls the sphincters, must be mature. Only then the child becomes aware of its ability to contract and relax the sphincter muscles. The maturity is not acquired before the age of 15 to 18 months. And it’s necessary a few more months until it all starts to function right. On average, children can’t start using the potty before the age of 20-26 months.