UK:
4.8 deaths of infants under one year old, per thousand live births.
http://en.wikipedia.org/wiki/List_of...mortality_rate
[Figures from the CIA World Factbook, April 2009 update.]
In the UK it counts as a birth if the infant draws a single breath.
The USA figure appears to be 6.3.
http://en.wikipedia.org/wiki/Infant_mortality