In most cases, it is not normal for children not to urinate for a day, because the normal amount of children’s urination for a day should be 4-6 times, or even more times, and children’s not urinating for a day is often due to the following pathologic factors: firstly, due to children suffering from diarrhea caused by the situation. After a child suffers from diarrhea, a lot of water is lost from the digestive tract, and dehydration and electrolyte disorders occur in the child’s body, which can cause the child to not urinate for a day. Secondly, it is caused by fever. If the child’s high fever persists without timely rehydration, coupled with the excessive consumption of water caused by high fever, this will also cause the child did not urinate for a day.