• Denise Leite Maia Monteiro, Fátima Regina Dias Miranda, Isabel Maria Santos Lacerda, Stella Regina Taquette, José Augusto Sapienza Ramos, Flavio Monteiro de Souza, and RodriguesNádia Cristina PinheiroNCPhttp://orcid.org/0000-0002-2613-5283Fundação Oswaldo Cruz, Escola Nacional de Saúde Sérgio Arouca - Rio de Janeiro (RJ), Brazil.Universidade do Rio de Janeiro, Instituto de Medicina Social - Rio de Janeiro (RJ), Brazil..
• Universidade do Estado do Rio de Janeiro - Rio de Janeiro (RJ), Brazil.
• Rev Assoc Med Bras (1992). 2021 Nov 1; 67 (11): 1712-1718.

ObjectiveThis study aimed to assess live birth frequency and age-specific fertility rates (ASFR) in the period 1996-2018 and the number of pregnancies at <14 years old in the period 2012-2018.MethodsThis was a cross-sectional study conducted by search on Live Births Data System (SINASC/DATASUS) database.ResultsThere was a variation in ASFR in Brazil of 0.78‰ in 1996 to 0.87‰ in 2018 (+11.5%). In the north region, it increased from 1.28‰ to 1.66‰ in 2018. In the northeast region, it increased from 0.72‰ to 1.66‰ (+131%) in 1996-2011, but decreased to 1.31‰ in 2018 (-21% in relation to 2011). When comparing 1996 and 2018, in the southeast region, there was a 22% decrease; in the south region, it was 48.2%; and in the Center-West region, it was 34%; but in the north region, there was a 29.7% increase, and in the northeast region, it was 81.9%. When adding girls who became pregnant aged 13 years and gave birth at 14, there was a threefold increase in the rate.ConclusionsThe increase of pregnancies in <14 years old in less developed regions of Brazil shows an association with socioeconomic factors and reveals the severe problem of rape of vulnerable persons in the country.

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