2. Intervention: The study will take place in four family medicine clinics belonging to the Mexican Institute of Social Security. Two clinics will receive the intervention and two will serve as control. In each clinic, fifty children and their mothers will be recruited. At the intervention clinics, the group of mothers will participate in seven weekly sessions and in two individual sessions at 3 and 6 months after the group sessions finish. During the sessions, the researchers will motivate the mothers to change feeding practices and encourage physical exercise of the children and family, this will improve the chance for their children for healthy growing. The control group will receive the usual care that consists only in the recommendations that the family doctor provides.