“…Details of the methodology used are available in a previous publication. 9 The following variables were collected: maternal age (< 18, 18 to 19, 20 to 34 and ≥ 35 years old), area of origin (urban and rural), self-reported skin color (white; non-white), maternal marital status (with; without a partner), maternal remunerated activity (yes; no), family income in minimum wages (< 3 and ≥ 3 minimum wages -MW), parity, corresponding to all previous pregnancies and including the current one (1, 2, 3 to 4 and ≥ 5), smoking during pregnancy (yes; no), weekly frequency of use of alcoholic beverages during pregnancy (none, < 2 and ≥ 2 units/week), category of prenatal care (public and private), category of hospitalization (public; private), type of delivery (vaginal; cesarean), and low birth weight of the infant (yes; no), considered to be the weight measured immediately after birth, with an approximation of 50 g.…”