Because there have been recent cases where expectant mothers were lured to their deaths by those looking to do just exactly this.
There was at least one Facebook posting of free used crib and baby clothes.
I believe that the victim survived that attack.
There have been 2 or 3 cases of women befriending pregnant young women, offering them friendship and help, resulting in their deaths.
There can not be too many warnings, especially for something we do not want to believe that people would ever do!
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Sylkat
Student Body President, Miskatonic University