The Oportunidades program increases the linear growth of children enrolled at young ages in urban Mexico.

The goal of this study was to evaluate the impact of Mexico's conditional cash transfer program, Oportunidades, on the growth of children <24 mo of age living in urban areas. Beneficiary families received cash transfers, a fortified food (targeted to pregnant and lactating women, children 6-23 mo, and children with low weight 2-4 y), and curative health services, among other benefits. Program benefits were conditional on preventative health care utilization and attendance of health and nutrition education sessions. We estimated the impact of the program after 2 y of operation in a panel of 432 children <24 mo of age at baseline (2002). We used difference-in-difference propensity score matching, which takes into account nonrandom program participation and the effects of unobserved fixed characteristics on outcomes. All models controlled for child age, sex, baseline anthropometry, and maternal height. Anthropometric Z-scores were calculated using the new WHO growth reference standards. There was no overall association between program participation and growth in children 6 to 24 mo of age. Children in intervention families younger than 6 mo of age at baseline grew 1.5 cm (P < 0.05) more than children in comparison families, corresponding to 0.41 height-for-age Z-scores (HAZ) (P < 0.05). They also gained an additional 0.76 kg (P < 0.01) or 0.47 weight-for-height Z-scores (P < 0.05). Children living in the poorest intervention households tended (0.05 < P < 0.10) to be taller than comparison children (0.9 cm, 0.27 HAZ). Oportunidades, with its strong nutrition component, is an effective tool to improve the growth of infants in poor urban households.