To determine whether the 2-month-old baby a night without urine is normal, need to be based on the specific situation: 1, if the 2-month-old baby drink less milk, coupled with sweating more, it will cause a night without urination, is a normal physiological phenomenon. The baby intake of milk is small, the discharge will be reduced accordingly, coupled with sweating, this time from the urine discharge of liquid will be reduced accordingly; 2, the baby suffers from viral enteritis or bacterial enteritis, and even suffer from renal insufficiency, etc., will appear overnight without urine, will be accompanied by other symptoms, such as renal insufficiency is often urinary creatinine increase, etc., this is a night without urine is caused by a pathological phenomenon.