If you are born with only one kidney, as long as the kidney function is intact and can maintain normal creatinine level, urea nitrogen level and other kidney indicators, it usually will not affect the life expectancy. However, if the kidney is infected, stone, or the kidney burden is increased during pregnancy, which leads to abnormal kidney function, it may affect the health and life expectancy. Therefore, as long as there are no other diseases or conditions affecting the kidney function, the life expectancy of a congenital kidney is not very different from that of a normal person. There are two kidneys in the human body, and the two kidneys can maintain normal kidney function when they are functioning at the same time. However, as long as the kidney function is intact, even if one kidney is lost, most people can maintain normal kidney metabolic function and it will not seriously affect the life expectancy and health of a person.