Infant Mortality in the United States (http://en.wikipedia.org/wiki/Infant_mortality#United_States) has the following passage:
"...in 2009, the US CDC issued a report which stated that the American rates of infant mortality were affected by the United States' high rates of premature babies compared to European countries and which outlines the differences in reporting requirements between the United States and Europe, noting that France, the Czech Republic, Ireland, the Netherlands, and Poland do not report all live births of babies under 500 g and/or 22 weeks of gestation.[6][9][10] However, the report also concludes that the differences in reporting are unlikely to be the primary explanation for the United States’ relatively low international ranking.[10]"
I did not follow the cited links as it's late and I'm tired. Good luck, though. I believe the information you are looking for is there somewhere.
Erm... this?
"...in 2009, the US CDC issued a report which stated that the American rates of infant mortality were affected by the United States' high rates of premature babies compared to European countries and which outlines the differences in reporting requirements between the United States and Europe, noting that France, the Czech Republic, Ireland, the Netherlands, and Poland do not report all live births of babies under 500 g and/or 22 weeks of gestation.[6][9][10] However, the report also concludes that the differences in reporting are unlikely to be the primary explanation for the United States’ relatively low international ranking.[10]"
I did not follow the cited links as it's late and I'm tired. Good luck, though. I believe the information you are looking for is there somewhere.