really?

From babycenter.com

"During the first 14 weeks of your pregnancy, fluid passes from your circulatory system into the amniotic sac. Early in the second trimester, your baby starts to swallow the fluid, pass it through his kidneys, and excrete it as urine, which he then swallows again, recycling the full volume of amniotic fluid every few hours. (Yes, this means that most of the fluid is eventually your baby's urine!) "

So....the baby is drinking it's own pee??? whaaaa?

Disturbed.  I feel I need more clarification on this.