title: [Are more girls than boys born in breech presentation compared with head presentation?].
abstract: In breech presentations a little more girls are born than boys, among head presentations there is a slight excess of boys. Among the factors favoring pelvic presentation birth weight has, according to present investigations, a decisive influence on the different sex relationship in the two presentations. Boys are little more common than girls in head presentation in the higher weight groups, in breech presentation in the upper and lower weight groups, while girls predominate in the middle weight groups. The absolute size of the middle weight groups in breech presentation causes the small excess of girls. A possible link with the slightly higher mortality of boys during the first year and its higher incidence in very high and very low weight groups are discussed as well as the dependence of the production of breech presentation on weight and mobility of the fetus.
mesh_terms: D001724:Birth Weight; D001946:Breech Presentation; D005260:Female; D006801:Humans; D007226:Infant Mortality; D007746:Labor Presentation; D008297:Male; D011247:Pregnancy; D012737:Sex Factors
vernacular_title: Werden bei der Beckenendlage mehr Mädchen als Knaben geboren im Vergleich zur Kopflage