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Infant and Child Mortality Infant mortality rate (IMR): The number of deaths of infants under age 1 per 1,000 live births in a given year. In less developed countries, the chances of dying are greatest at infancy and remain high during the first few years of childhood. A newborn child is fragile and has not developed immunities to common ailments. When a country has a high rate of infant death, it usually signals high mortality risk from infectious, parasitic, communicable, and other diseases associated with poor sanitary conditions and malnourishment. As a result, the infant mortality rate (IMR), or annual number of deaths of children under age 1 per 1,000 live births, is considered one of the most sensitive measures of a nation's health. World Infant Mortality Rates in Selected Countries, 2000 Worldwide about 8 million babies die annually before their first birthday. As the chart below "Deaths to children under age 5 by main cause" indicates, two of the primary causes of infant and child deaths are acute respiratory diseases — such as pneumonia, tuberculosis, and influenza — and diarrhea. Other infectious diseases, such as measles, are also major causes of deaths to infants and children. Death from these conditions is almost unheard of for infants in more developed countries. But in less developed countries where malnourishment weakens small bodies, medical facilities are scarce, and living areas may be unsanitary, infant deaths are common. In 2000, world IMRs range from 2.6 per 1,000 births in Iceland to 157 per 1,000 in Sierra Leone. As countries develop economically, infant mortality usually declines. The IMR in the United States was probably about 100 in 1900 — around the level of the IMRs of some of the poorest countries in the world today. The IMR in the United States has now fallen to below 10. Many countries have even lower rates, with Japan, Sweden, and Finland heading the list Death to Children under Age 5 by Main Cause In Less Developed Countries, 1995