"the US having an appalling infant mortality rate" do you have any sources? or more specifically articles or papers researching the cause of this high infant mortality rate?
Iceland IMR (the lowest) is 2.9, and the US is 6.3. Wow! That means twice as many kids in the US die as Iceland! That's appalling! But we're in the noise floor here. 0.03% vs 0.06% is noise floor, It's certainly not appalling.