Infant Mortality -- Strangely High in the USA

A recent report from the National Center for Health Statistics reports that the infant mortality rate in the United States is 6.9 infant deaths per 1,000 births. This is surprisingly high given the level of economic development in the United States in 2004. Indeed, "the United States’ international ranking fell from 12th in 1960 to 23d in 1990, and to 29th in 2004."
The United States is 29th? That seems low, doesn't it?