Infant mortality rate is the number of infants dying before reaching one year of age, per 1,000 live births in a given year. Estimates developed by the UN Inter-agency Group for Child Mortality Estimation (UNICEF, WHO, World Bank, UN DESA Population Division) at www.childmortality.org.
We can infer that the Infant Mortality Rate was really high in a lot of countries of Africa and Asia in the year 1991, but it has started to lower down in the current year. The leading causes of infant mortality are birth asphyxia, pneumonia, pre-term birth complications, diarrhoea, malaria, measles and malnutrition. Many factors contribute to infant mortality such as the mother's level of education, environmental conditions, and political and medical infrastructure. Improving sanitation, access to clean drinking water, immunization against infectious diseases, and other public health measures could help reduce high rates of infant mortality.