<prompt> Main source of prolactin in amniotic fluid is :DeciduaSynctiotrophoblastCytotrophoblastYolksac of fetus  <response>: Decidua is the main source of prolactin present in amniotic fluid. Decidual prolactin is not confused with human placental lactogenhpl which is produced only by the synctiotrophoblast. Ref:Williams Obs - 24 e pg 88. 