<prompt> The amniotic fluid is in balance by :Excretion by fetal kidneysMaternal hemostasisFetal intestinal absorptionAll  <response>: Ans. is a, b, c Amniotic fluid originates from In early pregnancy - As an ultrafiltrate of maternal plasma i.e., option b correct. By beginning of the second trimester - It consists of extracellular fluid which diffuses through the fetal skin i.e., option e. After 20 weeks - Cornification of skin prevents this diffusion and amniotic fluid is composed of fetal urine option a correct. Also know : The water in the amniotic fluid is completely changed and replaced in every 3 hours. Other minor contributors : Pulmonary fluid Fluid filtering through the placenta The fetus swallows 200 - 500 ml liquor every day at term. Option c correct i.e. Excretion by fetal kidneys; Maternal hemostasis; Fetal intestinal absorption 