The target population of this project is low SES families from Sao Paulo's western region. As part of an ongoing research study (the Western Region Project), 6000 mother-child dyads have been enrolled in a longitudinal study, which means that detailed records on family background and birth outcomes will be available to this project. The second enabling factor is the tight integration of the research project into the larger health system, which will be beneficial for the recruitment and training of health workers and when it comes to connecting with families.