Before drawing any conclusions, you may want to spend time looking at how different countries compile their infant mortality rates. The US has the most stringent rules in the world, other countries have much more lax requirement. This renders any comparisons useless.
Sorry, I forgot to add that the main reason the US has such a high infant mortality rate is due to the very high number of pre-term births. Preterm infants have much higher rates of death. And there is no way to tie pre-term births to vaccines.
Of course, there’s always *some* reason that the stats are wrong. So done with this conversation.