4-year-old baby at night without drinking water have to get up to urinate four times, may be a transient urinary frequency, belong to the normal physiological phenomenon, may also be by the urinary tract infection, mental factors and so on. 1. physiological phenomenon: 4-year-old baby at night without drinking water have to get up to urinate four times, belongs to the manifestation of transient urinary frequency, as long as the urine routine is normal, no other uncomfortable reaction, usually do not need to intervene in the treatment, usually 1-2 weeks can be relieved on their own. 2. urinary tract infection: when the four-year-old baby pathogens in the urinary tract abnormal reproduction caused by urinary tract infection, may cause pathological frequent urination. 3. Mental factors: when the patient is too excited and nervous before going to bed, or in the school life to develop the habit of regular urination, may also lead to the baby in the night without drinking water have to get up to urinate four times. Parents are advised to take their children to the doctor for examination in a timely manner, to clarify the cause of the targeted treatment, to develop good habits in life, pay attention to personal hygiene habits, to ensure that sleep is regular.