In breastfeeding infants, with more water intake and small bladder capacity, the daily urination can be about 20 times. 15 times a day at the age of 1 year, and 6C7 times a day in preschool and school-age children. There are many reasons for frequent urination, which should be analyzed in conjunction with specific performance and laboratory test results. The common causes are as follows. 1, urethral and seasonal factors: If urination is frequent but not much each time, no painful expression when urinating, and no other symptoms, the first thing to consider is local factors, such as inflammation of the urethra, prepuce, or pinworms stimulating the pubic area. In addition, seasonal factors, polyuria is normal in winter. 2, dietary polyuria: If frequent urination and at the same time more urine each time, and no other performance, first of all, we should pay attention to whether we drink too much water, especially children who like sugar and water occur more often. 3, neurogenic polyuria: young children with bladder forced urinary muscle dysplasia and neurological incompetence can occur spot polyuria during the day, up to 20-30 times, but normal nighttime urination, with a recurrent trend, urinalysis examination is normal, this disease is non-inflammatory caused by. 4, urinary tract inflammation: such as frequent urination, urinary urgency, painful urination or with fever, should be considered to have urinary tract infection, such as cystitis, pyelonephritis, etc., urinalysis microscopy can be detected pus cells or a large number of white blood cells, in serious cases accompanied by systemic infection poisoning symptoms, need antibacterial agent treatment. 5.Special diseases: If frequent urination with high urine volume, along with thirst and excessive drinking and wasting, attention should be paid to the examination of urine, if the urine contains sugar, then diabetes should be considered, if there is no sugar in the urine but low specific gravity, then urolithiasis should be thought of.