As a child grows, the ureter gets longer and the function of the valve improves, so primary vesicoureteral reflux sometimes improves or disappears over time.

随着婴幼儿的成长，输尿管变长，瓣膜的功能也有所改善，因此，原发性膀胱输尿管反流可能随时间改善，甚至消失。