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

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 (Ribeirao Preto, Sao Paulo State in 1978/1979, 1994 and 2010; Pelotas, Rio Grande do Sul State in 1982, 1993 and 2004; and Sao Luis, Maranhao 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 Ribeirao Preto from 1978/1979 to 1994, and -27.7g in Pelotas from 1982 to 1993) and increased +30.2g in Ribeirao Preto from 1994 to 2010 and +24.7g in Sao Luis from 1997 to 2010. In the first period, in Ribeirao 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 Ribeirao Preto and Sao Luis, females and those born 37-38 weeks in Ribeirao Preto and cesarean section in Sao Luis. 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.