Bosnia and Russia are both listed as having worse infant mortality rates than the US.
http://en.wikipedia.org/wiki/List_of_countries_by_infant_mor...
http://en.wikipedia.org/wiki/List_of_countries_by_infant_mor...
It lists Bosnia at 6.1 (50% lower than the Wiki).
The Wiki entry claims it uses the CIA factbook as a source. So I'm not really sure which source that Wiki entry is relying on.