Intrauterine growth retardation and preterm delivery

Article Abstract:

Intrauterine growth retardation is significantly associated with premature delivery and its incidence is underestimated by growth curves based on postnatal weight. Hospital discharge data from 5,757 infants born in 1990 were used to construct a graph that compared birth weight and gestational age. Data from ultrasounds taken to estimate the weight of the fetuses were available for 1,583 of these. Another graph was constructed from this data and used to assess the incidence of intrauterine growth retardation in the 5,908 infants born at the same hospital in 1991. As gestational age increased there was a decrease in incidence of growth retardation according to the curves generated by the ultrasound data. The curve generated by the postnatal data did not show such a decrease.

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Effects of fetal sex and race on risk of very preterm birth in twins

Article Abstract:

Male twin fetuses are more likely to be born prematurely than female twin fetuses. Researchers evaluated the effect of race and sex on premature births among 8,109 white and 1,884 black twin pregnancies. Males accounted for 55% of all premature births among white twins, representing a 9% excess of males. This excess was only seen in white twins. Among white twins, the risk of premature birth was 16% in female-female twins, 18% in male-female twins and 20% in male-male twins. This effect was not seen in black twins.

Analysis, Sex factors in disease, Disease sex factors, Twins

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Twin birth weight discordance and risk of preterm birth

Article Abstract:

Twin fetuses who have substantially different weights are likely to be born premature. This is especially true in fetuses whose weights differ by 40% or more by 32 weeks' gestation. Weight differences are usually caused by restricted growth in one of the fetuses.

Body weight

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