By Definition, infant mortality and Life Expectancy are only calculated for people born in that country TODAY, immigrant background barely comes into it.
Did you know even if you have medical insurance, it costs you money out of pocket (I think about $2000) to have a baby born in hospital in the USA? Antenatal appointments and tests cost extra, too. Plus monthly checks after baby is born (you usually pay for those, too).... talk about disincentive.
Obesity is a big factor, the article points out -- true in pregnancy and adult mortality.
Causes of infant morality in USA -- I half-wondered if the strong anti-abortion stance in USA might be affecting those figures (I don't have time to find comparable figures for other OECD countries). But I also KNOW that drug addicts conceiving babies is a big problem in the USA, too.
And the most messed-up people (drug problems, messed up family origins, chaotic lives) aren't organised enough to find out how to get free medical care, and then get themselves to appointments... and the system is woefully inadequate at chasing them up. They fall thru cracks, big time. Plus the system is over-worked and sometimes they express concerns which are brushed aside.
I know someone in California who was homeless crystal meth addict when she conceived. She got antenatal care late. She had badly managed gestational diabetes. Ended up at term at hospital more or less screaming at them to admit her because she "knew" something was wrong she had been clean a few months and it was her 3rd full-term pregnancy. They tried hard to send her away, but she make them admit her and very quickly they realised the fetus was in distress born by emergency C/S with meconium in the lungs, he barely survived.