Study setting
This study was conducted on 88 mother–child pairs. They referred to the Health Centers of Arak,Iran for routine preventive child health care (checking child growth, development, and immunization).Arak, the center of Markazi province, is located in center of Iran with a population of around 600,000.In Iran, public health systems for providing primary health cares were established in 1970. Each public health care center was included different health care units (family health, maternity and vaccination, etc.). These primary health care centres provide at least preventive health care (PHC) for all population categories [