The risks of spontaneous preterm delivery and perinatal mortality in relation to size at birth according to fetal versus neonatal growth standards

Article Abstract:

Fetal growth standards should be used instead of neonatal growth standards when estimating the risk of premature birth based on the size of the fetus. According to fetal growth standards, the risk of premature birth is two to three times higher if the fetus is too big or too small for its gestational age.

Standards, Risk factors, Premature birth, Growth (Physiology)

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Fetal umbilical cord oxygen values and birth to placental weight ratio in relation to size at birth

Article Abstract:

Oxygen availability appears to determine how large a fetus will grow, according to a study of 27,043 babies. Fetuses exposed to low oxygen levels may be smaller than normal and those exposed to high oxygen levels may be bigger than normal.

Research, Oxygen, Body size, Body weights and measures, Oxygen in the body

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Fetal oxygen saturation and fractional extraction at birth and the relationship to measures of acidosis

Article Abstract:

Measures of umbilical cord oxygen levels at birth are only weakly predictive of acidosis in the newborn. Inadequate oxygenation can cause the blood to become dangerously acidic. Researchers measured oxygenation in 18,250 newborns, and found that umbilical vein oxygen saturation averaged 63%, umbilical artery saturation averaged 24%, and fractional oxygen extraction averaged 62%. Babies with the umbilical cord wrapped around the neck, delivered by cesarean section after labor, or delivered postterm had higher oxygen extraction values, indicating greater fetal compromise.

Analysis, Diagnosis, Infants (Newborn), Newborn infants, Fetal blood, Acidosis, Fetal anoxia

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