1.1 Background of the Study Children's development can be divided into quantitative changes such as height and weight or qualitative changes such as critical thinking, problem solving and socialization (Zaidon , 2008). These changes occur periodically and continuously from childhood through adulthood. For optimal growth, breast milk should be administered during the infancy period as it contains adequate nutrients for children's development. Because human milk consists of 200 recognized components including real solutions, colloids, membranes, membrane-bound blood cells, and living cells (Ruegg & Blanc, 1982), optimal breastfeeding has been promoted globally by UNICEF for improve the survival of infants and children, as breastfed children have six times greater chances of survival, significant impact on health, nutrition and physical, mental and emotional development (UNICEF, 2013). In addition to this, since the 1990s, the Ministry of Health of Malaysia has recommended the National Breastfeeding Policy to suggest the exclusive practice of breastfeeding to infants until they reach 6 months of age and to continue breastfeeding breast up to 2 years old so that they have enough nutrients (MOH, 2008). In addition to this, previous studies had found a positive association between the practice of breastfeeding and the nutritional status of children, especially newborns, since breastfed children had a low probability of suffering from malnutrition or overweight as they received the maximum amount of nutrients from breast milk. Early childhood, which can be defined as the period from birth to eight years of age (UNESCO, 2010), is a period in which adequate nutritional intake is important for children because a balanced diet is essential for brain development, physical growth and health. It's... half of the document... from http://www.moe.gov.my/en/prasekolah.MOH. (2008). Guidelines for feeding infants and young children. Putrajaya: Ministry of Health Malaysia. Mossberg, H. O. (1989). 40-year follow-up of overweight children. The Lancet, 334(8661), 491-493.Ruegg, M., & Blanc, B. (1982). Structure and properties of particulate constituents of human milk: a review. Food microstructure, 1.UNESCO. (2010). Implementation of the Convention on the Rights of the Child, . New York: United Nations.UNICEF. (2013). Breastfeeding. Feeding of newborns and children. from www.unicef.org/nutrition/index_24824.htmlWHO. (2014). Feeding infants and young children. In WM Center (ed.), (February 2014 ed.). Geneva: World Health Organization. Zaidon, S. (2008). Satu Tinjauan Literature Penggunaan Portfolio Kanak-Kanak. Kampus Pendidikan Islam, Maktab Perguruan Islam.