Sociodemographic profile of primiparous mothers from nine birth cohorts in three Brazilian cities

Fertility reduction is a phenomenon observed in demographic transition. The changes noted female fertility represent need for adjustment on health services regarding and family planning support. Thus, this study aimed to perform descriptive analysis by tracing the sociodemographic profile of primiparous mothers belonging nine Brazilian birth cohorts, three cities from different states. Standardized questionnaires were applied assess reproductive characteristics covariables. Primiparous defined as women whose child included cohorts was their firstborn child. Sample description performed using variance (continuous variables) chi-square (categorical variables). In total, 44,615 analyses 41.8% (95%CI: 41.3; 42.2) categorized primiparous. primiparity rates lowest Ribeirão Preto (São Paulo State) 1978 (32%; 95%CI: 30.9; 33.1) highest most recent reaching up 50% participants Luís - Maranhão State 2010: 47.2%; 45.8; 48.6; 50.2%; 49.1; 51.4); Pelotas (Rio Grande do Sul 2015: 49.4% 47.9; 50.9). mothers’ age schooling increased over years all cohorts. Maternal at first childbirth behaved similarly studied cities. There an increase proportion first-time that older, higher educated belonged richer income groups. Also, teenage (aged 15 or younger) until early 2000’s started decreasing around 2010, especially among poorer