Low birth weight in a municipality in the southeast region of Brazil.

Objective: to identify the prevalence of low birth weight in the city of São Paulo.

Method: epidemiological cross-sectional study with data collected by means of the Brazilian Live Birth Information System related to births occurred in the city of São Paulo between 2007 and 2013. Maternal, gestational, childbirth, and neonatal variables were analyzed descriptively and by association.