Lisa Marasco writes:

 they said the moms kept the babies nice
>and warm, but they were concerned that the same didn't seem to hold true with
>the dads. Anyone else here of this? Any explanations or comments? Kathy
>Dettwyler?

Uh, well, I don't really know anything about "chest heat pads" but it
certainly stands to reason that if such a thing exists in humans, it's only
in females, since in all the higher non-human primates (Old World monkeys,
apes) fathers play little to no role in infant care -- the offspring are in
constant contact with the *mother's* body, but the father doesn't hold the
offspring.

Kathy D.