To potty train a 9 year old boy you remove the diapers or pull ups and put the 9 year old boy in underwear and then have the 9 year old boy drink plenty of water and other liquids so the 9 year old boys bladder fills up.
Then set at timer for 20 to 30 minutes or a few minutes or so before they pee.
Then take the 9 year old boy to the toilet and have them sit down on the toilet and try to pee or poop.
Reward them for pee or poop they make in the toilet and have them flush and if they have an accident such as pooping in their underwear, then take the poop and dump it into the toilet and show the 9 year old boy that poop and pee goes into the toilet.
Then teach them how to wipe and you may have to help them for awhile.
A 9 year old should be easier to potty train than a toddler, assuming the 9 year old is healthy and is verbal and not developmentally delayed.
Regression in potty training 9 year old is the 9 year old child's sudden neglect of potty practices such as peeing in their pants, pooping their pants, desire to return to diapers and not going to the toilet.
Regression in potty training is normal and having a new baby in the family or the 9 year old or other child simply wanting to be the baby or just wanting to wear diapers can cause potty training regression.
You could give into the 9 year old or other child and put them back in diapers for awhile and they may get tired of it or they may enjoy it and want to be kept in diapers.
Boys should be potty trained sitting down and then eventually they can learn to stand up to pee.
In the beginning they should be potty trained even with peeing by sitting down until they can learn to aim and then you can teach the boy to pee standing up.
Boys are harder to potty train than girls and most boys take longer to potty train than girls do.
The reason girls are easier to potty train than boys is because girls tend to be more advanced in their language and physical development and these skills help the girls potty training move forward easier.
Boys tend to be less advanced in language and physical development which prevents the potty training from moving forward as it should.
The most common age to potty train boys is between the ages of 2 years old to 3 years old.
Most boys are potty trained by age 3 although some boys may not potty train until age 3 and 1/2 years to 4 years old.
Some boys are potty trained as early as 18 months of age but even when you begin potty training at 18 months the child still needs lots of help with using the toilet.
When it's all said and done even starting as early as 18 months the child is not fully potty trained and able to use the toilet independently until age 3 to 3 and 1/2 years old.
If you wait until at least 3 years old the boy will have better bladder control and be more able to get to the toilet on their own and pull their pants up and down and wipe without much or any assistance.
I've always waited until my kids were 3 before even beginning potty training and went straight to underwear without using pull ups.
Once they were 3 my kids both boys and girls all potty trained within a few weeks to a few days.
When you potty train as early as 18 months or under 2 years to 3 years old it's more the parents being trained to take the child to the toilet and remind the child to use the toilet.
If you potty train before 3 you will be dealing with lots of accidents which means in reality the child is not ready.