The main challenge faced by the project is the general lack of stability and trust in the targeted areas. Families residing in informal settlements, often illegal, tend to move frequently, and are often not willing to receive or interact with strangers. In some neighborhoods, outsiders are not welcome at all, so that regular meetings with mothers will be difficult. The strong links with the University Hospital should help overcome these barriers; local sensitization meetings will be organized to reduce the risk of refusals and attrition.