D.C.
Hello T. I would recomend the ones that attaches to the toilet with a kid step tool so that he can get through.And if he or she is not comfortable than put some books to in the bathroom close to the toilet and believe me they learn fast to the bathroom and save you the pull ups that are so expensive. I'm mother of three boys they were a year apart and learn the toilet in time. But for napping or at nite you will need to keep using the pullups until they start school. Boys take longer to stop wetting at night. Not every day but it will happen.Good Luck