The Birth Process

The Birth Process
By S.R. Hooper|W. Umansky
Pearson Allyn Bacon Prentice Hall

As delivery time nears, the mother’s calcium level drops. This decrease is particularly marked in the pelvic area so that the mother’s pelvis can be extended as widely as possible to accommodate the fetus. Simultaneously, muscles around the uterus and cervix also become larger and more flexible to accommodate the fetus during birth. In preparation for birth, the fetus rotates in the womb so that it will be born head first. This rotation is triggered by hormonal action in the mother and is the first indication of the onset of labor. If fetal rotation does not occur, the baby will be born feet first. This awkward type of delivery is called a breech delivery and occurs in about 3 to 4% of births, with increased frequency noted in preterm deliveries (i.e., 25% prior to 28 weeks gestation, 14% at 29 to 32 weeks gestation, 7% at 32 weeks gestation) (Lee et al., 1998). A breech delivery can cause anoxia (lack of oxygen), intracranial hemorrhage (bleeding), and transient lowering of the fetal heart rate, particularly in the premature infant (DeCherney, Nathan, & Goodwin, 2006). Although a breech delivery typically is not of major consequence to outcome, some association has been made to abnormalities in the child, with central nervous system anomalies being noted most frequently (Mazor, Hagay, Leiberman, Biale, & Insler, 1985). In addition, nearly half of all cases of hydrocephalus, myelomeningocele, Prader-Willi syndrome, and trisomy are associated with breech presentation (Krebs & Langhoff-Roos, 2006).

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