10 million children die each year, mostly from preventable causes
"More than 10 million children die each year, most from preventable causes and almost all in poor countries. Six countries account for 50% of worldwide deaths in children younger than 5 years, and 42 countries for 90%."
Robert E. Black, Saul S. Morris, Jennifer Bryce. "Where and why are 10 million children dying every year?" The Lancet, Vol 362, June 28, 2003.
Their Source: WHO. The World Health Report 2002: reducing risks, promoting healthy life. Geneva: World Health Organization, 2002. and Amhad OB, Lopez AD, Inoue M. The decline in child mortality: a reappraisal. Bull World Health Organ 2000; 78; 1175-91