19-nortestosterone furylpropionate (Demelon), a newly synthetized anabolic steroid in Japan, showing an excellent anabolic effect on m. levator ani of the rat, was given by subcutaneous injection to 51 newborn babies weighing over 2501 g and to 26 immature babies, and the increase in body weight and the days required for the recovery of weight at birth were observed under consideration of the lactation and other factors.
