Three-year-old male babies often leak urine, there may be urinary tract infection, circumcision, hidden spina bifida and so on. 1. Urinary tract infection: for example, acute cystitis, the pathogenic bacteria will stimulate the bladder after the bladder, will produce a very urgent urination, the child may have part of the urine from the urethra leakage. 2. Hidden spina bifida: There is a defect of the spinal canal due to genetic factors and insufficient intake of folic acid. Hidden spina bifida usually does not have any symptoms, but some people may have leakage of urine and soreness in the lower back. 3. Hypospadias: When a baby boy’s foreskin is too long or the outer opening of the foreskin is narrow, every time the child urinates, a part of the urine may be pocketed inside the foreskin, and this residual urine will flow out one after another, thus forming a leakage of urine. When a three-year-old baby boy often leaks urine, it is recommended to consult a doctor in time, follow the doctor’s instructions for further examination, with the help of the doctor for targeted treatment.