During 2 hours after delivery the condition of the woman is good: the uterus is firm, spherical, the fundus of uterus is on level of the navel, no hemorrhage. The clamp, placed on the umbilical cord segment, remains on the same level. On deep inhalation and on pressing with edge of the hand above symphysis the umbilical cord retraction into the vagina. There is no bloody discharge from the genital tracts. What should be the further tactics of the doctor?