Infants 5 hours without peeing may be normal, but also need to exclude pathological factors, need to be analyzed according to the specific situation of the baby. 1. Normal phenomenon, infants due to vigorous metabolism, the body surface area is larger, water loss is more, if in the case of hot weather, sweating, etc., the emergence of 5 hours without peeing is also normal, need to give the baby in time to replenish the water, to avoid dehydration. 2. Pathological factors, such as dehydration, most often seen in gastroenteritis and other diseases, the baby is accompanied by vomiting, diarrhea and other gastrointestinal symptoms; renal diseases, such as acute glomerulonephritis and other diseases, the baby can appear urinary, anuria and other symptoms. Babies appear 5 hours after the situation of not urinating, give appropriate supplemental water, still not improved, need to go to the hospital pediatrics in a timely manner, so as not to delay the condition.