Newborns urinate sparingly, and five hours without urine is normal if the underlying vital signs are stable. Normally, 93% of newborns urinate within 24 hours after birth and 99% within 48 hours. Due to the low intake of newborns, the normal urine output in the first 48 hours after birth is usually 1 to 3 ml/kg per hour, and the average urine output in 2 days is 30 to 60 ml/d, and 100 to 300 ml/d in 3 to 10 days, with urination only 4 to 5 times per day. It is normal for the urine to be darker and slightly cloudy for 2 to 3 days after birth. It is normal for a newborn to go five hours without urine if the underlying vital signs are stable. When the newborn’s urine output <1.0ml/(kg*h) is oliguria, and <0.5ml/(kg*h) per hour is anuria. When oliguria or anuria occurs, there may be renal impairment, which should be taken seriously and seek medical attention in time.