I don't think there's much of a difference between those things.
To correct my earlier post I believe it was only the babies who died who were named, not the other babies, but then some who did not die had siblings who did so I think maybe 6 or so weren't named but even if they weren't people would have known, if the parents didn't tell them then someone else would have. Or maybe there was older siblings who would have known, that would be a huge secret to have to keep.