Mean birth weight among term newborns: direction, magnitude and associated factors

Abstract

A trend towards increasing birth weight has been shown, but factors that explain these trends have not been elucidated. The objectives of this study were to evaluate changes in mean birth weight of term newborns and to identify factors associated with them. All cohorts are population-based studies in which random samples of births (Ribeirão Preto, São Paulo State in 1978/1979, 1994 and 2010; Pelotas, Rio Grande do Sul State in 1982, 1993 and 2004; and São Luís, Maranhão State in 1997/1998 and 2010, Brazil). A total of 32,147 full-term, singleton live births were included. Mean birth weight reduced in the first study period (-89.1g in Ribeirão Preto from 1978/1979 to 1994, and -27.7g in Pelotas from 1982 to 1993) and increased +30.2g in Ribeirão Preto from 1994 to 2010 and +24.7g in São Luís from 1997 to 2010. In the first period, in Ribeirão Preto, mean birth weight reduction was steeper among mothers with high school education and among those born 39-41 weeks. In the second period, the increase in mean birth weight was steeper among mothers with low schooling in Ribeirão Preto and São Luís, females and those born 37-38 weeks in Ribeirão Preto and cesarean section in São Luís. Birth weight decreased in the first study period then increased thereafter. The variables that seem to have been able to explain these changes varied over time.

Amniotic Sludge and Prematurity: Systematic Review and Meta-analysis

“…Despite the better understanding of the factors involved in premature parturition and the development of resources to inhibit preterm labor, the prevalence of prematurity in recent decades has not decreased, and it is estimated to range from 5% to 18% in the world, and from 6.4% to 15.2% in Brazil, which corresponds on average to the worldwide birth of ∼ 15 million preterm concepts. 6 7…”

“…5 Despite the better understanding of the factors involved in premature parturition and the development of resources to inhibit preterm labor, the prevalence of prematurity in recent decades has not decreased, and it is estimated to range from 5% to 18% in the world, and from 6.4% to 15.2% in Brazil, which corresponds on average to the worldwide birth of 15 million preterm concepts. 6,7 The main cause of preterm labor is idiopathic, corresponding to 50% of the cases. Among the known causes, we highlight the presence of maternal infection, cervical insufficiency, and short cervix.…”