Potty training can begin as soon as parents and children want to start, but it's usually easier to wait until your child is at least around the age of 2 to start potty training. However, each child is different and you might sense when the time is right. Girls tend to be ready to potty train a little earlier than boys, but the readiness signs for both boys and girls are the same. Most children in the United States are bowel and bladder trained by 4 years of age.