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Infant mortality is the death of infants in the first year of life. Major causes of infant mortality include congenital malformation, infection and SIDS.
Infanticide, abuse, abandonment, and Sierra Leone. (That's 28% of all children born die before they turn 5 years old.) The 29 countries with the highest U5MR are in Africa. The U5MR of the United States is 8/1000, and there are 31 countries with lower U5MRs. Sweden's is the lowest at 3.
The most common cause of IMR of all children around the world has traditionally been dehydration from diarrhea. Because of the success of spreading information about Oral Rehydration Solution (a mixture of salts, sugar and water) to mothers around the world, the rate of children dying from dehydration has been decreasing and has become the second most common cause in the late 1990s. Currently the most common cause is pneumonia.