Enuresis

A 4-year-old boy comes to your office for a well-child visit. His mother is concerned about bedwetting, noting he has never been completely dry, and wets the bed 1-2 nights a week. She is frustrated because she was able to potty train his two older siblings by 3 years of age. The patient has no daytime incontinence, no urgency or frequency, no constipation or fecal incontinence, weight loss, or excessive thirst. He is not allowed to drink excessively at night. His past medical history is noncontributory and he is otherwise developing normally. Which of the following is the most appropriate next step in management?