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两岁以内的婴儿由于膀胱充盈,反射性的排尿,这是正常的生理现象。正常情况下小儿4岁以上就不再尿床了,膀胱充满的信号可通过神经反射使睡眠的儿童觉醒。4岁以后的孩子,如果白天发生不自觉排尿或夜间不能从睡眠中醒来自觉排尿,称为遗尿症或夜间遗尿症。
Infants within two years of age due to bladder filling, reflex micturition, this is a normal physiological phenomenon. Under normal circumstances, children over the age of 4 no longer wet the bed, the bladder full of signals through the neural reflex to sleep in children wake up. Children after 4 years old, if during the day unconscious urination or sleep can not consciously urinate at night, known as enuresis or nocturnal enuresis.