List by the United Nations Population Division
Infant mortality rates per 1000 live births
Rank Deaths
per 1000
22 4.8 UK
32 6.3 USA
List by the CIA World Factbook 2009
Infant mortality rates per 1000 live births
Rank Deaths
per 1000
32 4.85 UK
46 6.26 USA
The way we count “live” births and how the British and others count them is different. This statistic you show has been disputed for several years.
Apples and oranges. Far more high risk pregnancies go to term in the US. Further the data collection standards from country to country vary wildly.
The United States counts very early preemies as babies and tries to save them. Most of Europe and Asia count them as stillbirths, neither recording the birth as a birth or the death as infant mortality. Our preemie survival rate is actually 20-25 % better than Japan and Europe, because we try to save them.