Child mortality in Sierra Leone is the highest ranked in the world. The main causes for child mortality are maternal factors, environmental factors and health factors. Minimal research has been carried out on health factors in Sierra Leone. The objective of this study is to see how maternal and environmental factors have an effect on health factors, which in turn cause child mortality. The data used were from the 2008 Sierra Leone Demographic and Household Survey (SLDHS). The study showed that child mortality had statistically significant factors associated with it: place of residence, birth number, religion and type of toilet facility. Furthermore, the SLDHS had not given much information regarding the cause of diseases affecting children, so we looked only at the effects they had on children. Acute respiratory infections, diarrhoea and measles each had one variable that was statistically significant. As for pneumonia, there were no variables associated with children contracting the disease. Background Child mortality is a subject that has been looked at, but not really invested in by a number of governments worldwide. In 1970 it was estimated that the amount of children who had died under the age of five throughout the world was 17 million children a year (Gordon et al., 2004). This number had been reduced to about nine million children a year in 2009 worldwide (Morley, 2010). The reduction was good overall. However, the decline only affected certain countries, while others had done little or nothing to reduce their child mortality rates (Gordon et al., 2004). In 2010, the United Nations (UN) estimated that 16 third-world countries had managed to reduce their child mortality rate by 40% in the last two decades (United Nations [UN], 2010). This reduction, according to the Millennium Development Goals (MDG), is short of the target which the UN was aiming for (Steadland and Skoglund, 2008). Furthermore, it has been estimated that one in five of the world's children reside in the sub-Saharan region (United Nations, 2010). Therefore researchers have made it a priority to tackle the child mortality rate in sub-Saharan Africa due to its increase between 1990 and 2008 of approximately 4 million to 4.4 million child deaths (United Nations, 2010). In addition, the World Health Organization (WHO) global indicators show that the nations with the lowest child mortality rates in 2000 were all