Since the frequent urination has returned, please do not restart the previous urinary alkalizer or antibiotic without consulting your doctor. The next step is to get a fresh urine routine and urine culture test. This helps identify if a new bacterial infection is present and which specific medicine will treat it effectively. Since this is a recurring issue, your pediatrician may also check for simple underlying causes like constipation, toilet habits, or structural issues. For now, encourage your child to drink plenty of water and avoid holding their urine. Rest assured, this is a common and highly treatable concern once the exact cause is identified.