steve2: A further complicating factor is that in many Western countries, babies with serious congenital conditions born to JW parents become state wards when medical professionals deem surgery is needed, including blood transfusions.
That is true. However, the number of infants/children that have succumbed to a no blood position are not included in any of the estimates that have been done on JW blood deaths. The retrospective studies that have been done, on which the estimates have extrapolated from, have only included the adult population.
And yes, sometimes a medical team will apply for transfusion rights for a child. This usually only happens when all other alternatives have either been tried or the noblood treatment does not have the evidence to back up its effectiveness.
For an idea of how many Jehovah's Witness children are subjected to no blood treatment, check out the results of a google scholar search that brings up several medical cases involving Jehovah's Witness children where the medical teams have went ahead with no blood procedures. And then, add in the indeterminate number of children who expire before their case becomes something to make its way into medical journals.
https://scholar.google.ca/scholar?hl=en&q=pediatric+jehovah&as_sdt=1%2C5&as_sdtp=&oq=pediatric