. . "The characteristic sign of impending birth during the second stage of labor. The presenting part of the head of fetus is visible and firmly rimmed by the maternal vaginal wall.NCI" . "C92763"^^ . . . "CrowningPTNICHD" . . "C0233212"^^ . "NICHD"^^ . "Crowning during Childbirth"^^ . . "Crowning during ChildbirthPTNCI" . "Sign or Symptom"^^ . "Crowning during Childbirth"^^ .