Know your Nephron Numbers...

http://www.sciencedaily.com/releases/2013/05/130530192425.htm

Kidney nephron levels one is born with vary from 200,000 – 2,000,000 – low birth weight (prematurity) is associated with this. “Given that low birth weight occurs in 15 per cent of live births worldwide, the study has implications for maternal health and clinical screening processes.”