Dear Ms. McMasters,
My opinion is that your son is too young for you to invest in the system you mentioned.
While approximately 75% of children are dry during the night as they go into their fourth year, this still leaves a considerable number of children who are not. In other words, your son's situation is not particularly unusual.
Bed-wetting occurs most often during the
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Your son is a bit too young to profit from reward systems, so it's not surprising this did not work. Reward systems are a form of behavioral conditioning, as are the various wet-stop alarm systems that are employed to help children stay dry. To attempt such systems prior to the age of seven is not likely to benefit the child (though, of course, there are exceptions to the rule).
Eliminating pull-ups can be a useful measure to help children who are trying to master toilet training during the day, but this same measure is not productive in eliminating nocturnal enuresis.
You would not be making a mistake to be patient. See how things go over the next year (or even longer). Should the bed-wetting persist, you can always attempt conditioning systems later on, at an age when your son will be more ready, developmentally, to profit from them.
Finally, to assist him now, try to limit his intake of large amounts of fluid after 6:00 p.m. or so, though you don't have to have an absolute restriction.