Not only do we try to save every baby possible, there is no standard for recording infant mortality.
This country reports ALL babies that die, other countries use very loose standard, such as babies born less than a certain weight are considered abortions (and low birth weight babies have extremely high mortality rates). This alone will scew the statistics like crazy.
I really hate when people try to use this stat as a way of showing how broken our healthcare system is. It's not a real-picture statistic