This study is looking at how well high-dose Vitamin D helps kids with **OAB** (Overactive Bladder) that causes them to wet their pants. It compares three treatments: standard behavioral therapy alone, with Vitamin D, and with a medicine called solifenacin. **Behavioral therapy** involves changing habits to improve bladder control. **Solifenacin** is a drug that helps calm the bladder muscles.

**Key Points:**

• Duration: Participate until the study ends; involves regular check-ins.
• Requirements: Kids aged 5+, diagnosed with wet OAB, low Vitamin D levels (<35 ng/ml), and consent from guardians.
• Exclusions: Kids with serious diseases, neurological issues, or other specific health problems.

Researchers want to learn if Vitamin D helps kids with wet OAB and if it's safe. They will take various measurements, like how often children urinate and their quality of life. Children must keep a diary of their bathroom visits for seven days. This study could help doctors decide the best way to treat kids with this problem in the future.