Oligohydramnios Causes & Solutions By Dr CHOI Seo-hyun During pregnancy, amniotic fluid volume varies. It starts from around 30 cc at 10 weeks, peaks at 800-1000 cc in late pregnancy, and decreases towards delivery. Maintaining optimal levels is vital for both mother and fetus. Oligohydramnios occurs when there's insufficient amniotic fluid during pregnancy, affecting about 1% of pregnancies. Cl..