A one-year-old baby who does not urinate for more than ten hours may be caused by factors such as too little fluid intake, excessive fluid loss or disease factors. 1. too little fluid intake: the baby intake of water, milk and other liquids is too little, may cause more than ten hours without urination. 2. Excessive loss of body fluids: A hot environment can lead to excessive sweating, and a large loss of body fluids can also lead to a decrease in the baby’s urine output. 3. Disease factors: baby if fever, vomiting, diarrhea and other symptoms, the baby will make the baby lose a lot of body fluids, if not in time to replenish, the baby will reduce the amount of urine; if you suffer from nephritis, may make the renal filtration function is impaired, the generation of urine is reduced; if you suffer from urethral stenosis, will lead to the urine can not be normally discharged, and even cause hydronephrosis. A one-year-old baby who does not urinate for more than ten hours may also be caused by other medical reasons. If this is the case, it is recommended to go to the hospital as soon as possible to actively identify the cause of the disease, if the disease is caused by the need to follow the doctor’s instructions for treatment.