A bath of adults can be a very intimidating place for children who are all much larger and threatening him. That is why you, and you may need, making some changes to make your child feel more comfortable coming in and using it, while it is also good for you. One of the main things you should buy is a seat the size of him or a urinal.
The toilet is a place that scares most kids, so if your child refuses to use, it is best to buy him a potty and feel in control of the situation. But if your son, on the contrary, attracted to the toilet, you can buy a chair for him that has a smaller opening, so that is most comfortable for him to sit there. You are also recommended to choose one with handles, so your child will feel safer sitting there.
Some of these seats are even filled with water so that your child will feel soft when he sit and have music that sounds when used. Some others have a small staircase so that your child has no trouble reaching the toilet, which you can use as a small bank for your child to reach the sink to wash their hands after using the toilet and even for brushing teeth.
The best age to start to buy the potty or potty seat for children to put on the toilet, is eighteen months. However, you are recommended to buy it before and put it in the bathroom ahead of time so that your child is not in use, and will become used every time he goes to the bathroom or because you wear it or you want to wash their hands.