INTRODUCTIONPrenatal care (PN) may contribute to more favorable maternal and perinatal outcomes by enabling early detection and timely treatment of various diseases; in addition to the control of some risk factors that cause complications to women's health and that of newborns
(1) .In Brazil, although infant mortality rates have decreased in recent decades, this decline has been uneven across states and municipalities, as well as between areas of a specific municipality (2,3) . To improve national rates and decrease these regional differences, the Brazilian government has taken several measures to increase women's access to prenatal care, in order to qualify the actions developed within it and to modify the model of health care for deliveries.
For pregnant women of normal risk, the Program for Humanization of Prenatal and Birth (PHPB) established basic rules for qualified and humanized care, recommending a first prenatal care consultation before the fourth month of pregnancy, at least six prenatal visits (one in the first trimester of pregnancy, two in the second and three in the third), and puerperal consultation until 42 days after birth (4) .
Furthermore, in the city of São Paulo, with the goal of improving the quality of maternal-infant care, the Network for the Protection of the Paulistana Mother (Rede de Proteção à Mãe Paulistana) was created in 2006 (5) , which works by way of articulation, integration and monitoring of ambulatory healthcare services as well as municipal and state hospitals.