[Study on the timing of clamping the umbilical cord and the hematological data].
D001774:Blood Chemical Analysis; D003250:Constriction; D005260:Female; D006801:Humans; D007231:Infant, Newborn; D007748:Labor Stage, Second; D007743:Labor, Obstetric; D011247:Pregnancy; D013997:Time Factors; D014470:Umbilical Cord