[Serum levels of prolactin, progesterone and estradiol in nursing mothers].

The serum concentrations of prolactin, progesteron and estradiol affecting twenty-four parturients in the puerperium period are studied. The proportion of prolactin on one hand in accordance with progesteron on the other hand are examined. The required condition for lactogenesis is serum concentration of prolactin above 100 ng/ml and the low levels of progesteron and estradiol. The effect of primary breast feeding on the level of prolactin concerning ninety suckling mothers has been studied. The installment of a breast six hours after child-bearing stimulates the prolactin synthesis whereas the late breast feeding after seventy-two hours decreases the concentration of prolactin and suppresses lactation.