I bet more children die due to the blood issues than adults. And I think there is a bigger reason than the health threats. In the JW world, kids are ok, but they are (lets face it!) evidence that one has a sex life, they are proof that one finds other things at least as important as the WT, and that one is not giving their best effort to the Borg. LOSING a child due to the 'blood issue' makes one a hero in their congregation. They will always have a 'theocratic war story' to tell (whether the child survives or dies) and they get JW cred for it. They get extra credit with the Borg, elders, Jehovah, and their JW family. They get away with a LOT afterwards too-because of all the stress.
I fully recognize how cynical this sounds, but how often do we hear stories about children and teenagers-and how often about adults? Kids make better press, sure, but that goes both ways, for the WT and the media at large. Children also have less blood to play around with.
Those JWs with the four babies-well, there were six-obviously NOT putting kingdom interests first. LOSING their babies gets them off the hook, they get sympathy and less grudging help. If their babies all survived, they would be thought fortunate, but the sheer amount of kids would work against them in the WT org in spite of it-one cute baby is ok, but six is just--unseemly! Losing those babies is good for them societally (WT style).
Those are factors I believe are part and parcel of the reason JW children are so expendable in spite of the fact that the worst 'JAH'/WT will do is shun THE PARENTS!!!
I think many of the teenagers are pressured and/or misled. That is just my cynical way of looking at it, and I apologise for any offence or hurt given. I don't believe that is every case.