I take a look at infant mortality trends in a few developed nations. 3 patterns to note.
1. All countries have improved, you can see this globally (data to come, or see HDI data).
2. Certain countries like Slovakia have made vast improvements over the last 25 years
3. While the US has improved, its improvement lags that of many of its peers. Slovakia catches up in 25 years. While US is a rich nation on many measures eg GDP/capita, it lags on many HDI measures and continues to slip behind on overall HDU. (UK to some extent as well, though not so much on infant mortalilty)