小儿生后10～18个月时就可以训练自觉地排尿,但有的小儿至2～3岁时白天虽可控制排尿,但夜间仍有无意识的排尿,这是一种生理现象。大多数小儿在3岁后夜间不遗尿,若5岁以后每周至少有一次发生随意排尿即称为遗尿症。 10 to 18 months after birth, children can be trained to consciously urinate, but some children to 2 to 3 years old can control urination during the daytime, but there is still unconscious urination at night, this is a physiological phenomenon. Most children in the night after the age of 3 do not forget to urinate, if after 5 years of age occur at least once a week urination is called enuresis.