It is not normal for an 8-month-old baby to go 12 hours without peeing, which can be caused by low water intake, excessive sweating or fever. If your 8 month old baby doesn’t urinate for 12 hours, it may be due to insufficient intake or the child sweats more, such as feeding the child less water, milk, or liquid food, or in the hot summer when the baby sweats more, it is easy to have no urine for 12 hours. In addition, if the 8-month-old baby has a fever, vomiting, diarrhea, etc., this time additional loss of a lot of liquid, may also lead to the 8-month-old baby 12 hours without urine. When the 8-month-old baby 12 hours without urine does not get better or is accompanied by other symptoms, it is recommended to go to the hospital in time.