The normal value for 1-hour urine output is 1 to 3 mL per kilogram of body weight per hour. If the urine output is less than 1 mL per kilogram of body weight per hour, oliguria is considered; if it is less than 0.5 mL per kilogram of body weight per hour, anuria is considered clinically. Urination occurs 4 to 5 times per day in the first few days after birth, increasing to 20 to 25 times per day after 1 week, 15 to 16 times per day at 1 year of age, and decreasing to 6 to 7 times per day after 3 years of age. If one’s urine output is significantly abnormal, it is recommended to visit the hospital promptly to clarify the specific cause under the guidance of the doctor.