Main source of prolactin in amniotic fluid is :
Decidua
Synctiotrophoblast
Cytotrophoblast
Yolksac of fetus
Decidua is the main source of prolactin present in amniotic fluid. Decidual prolactin is not confused with human placental lactogen(hpl) which is produced only by the synctiotrophoblast. Ref:Williams Obs - 24 e pg 88.
General obstetrics