Answer: An AFI between 8-18 is considered normal. Median AFI level is approximately 14 from week 20 to week 35, when the amniotic fluid begins to reduce in preparation for birth. An AFI < 5-6 is considered as oligohydramnios. The exact number can vary by gestational age. As the baby grows it produces more amniotic fluid. The amount increases until the baby is about 32 weeks gestation. The amniotic fluid levels then remains constant until the baby is full term (37 to 42 weeks) when the levels start to decline. Amniotic Fluid Index (AFI): this method uses the sum of four of the deepest vertical pocket of fluid. The normal range for the AFI is 5-25 cms. so consult your doctor once.