Updated

More than 200 million children worldwide do not get basic health care, leading to nearly 10 million deaths of children under the age of 5 annually from treatable ailments like diarrhea and pneumonia, a U.S.-based charity said Wednesday.

Nearly all of the deaths occur in the developing world, with poor children facing twice the risk of dying compared to richer children, according to Save the Children's global report.

Sweden, Norway and Iceland top the ranking in terms of well-being for mothers and children in 146 countries surveyed, while Nigeria ranks last.

Eight out of 10 bottom-ranked countries are in sub-Saharan Africa, where four out of five mothers are likely to lose a child in their lifetime, Save the Children said.

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