I'm not a doctor, but having had small kids in the US and in New Zealand I noticed a marked difference in the number of jabs that are recommended. I don't know

I'm not a doctor, but having had small kids in the US and in New Zealand I noticed a marked difference in the number of jabs that are recommended. I don't know the reasons for this but the idea that it may be correlated with a larger impact of business incentives in insurance-company US versus single payer NZ doesn't seem wildly implausible to me.