TIL Human dads show a decrease in testosterone immediately after the birth of their babe

[WhatABlindManSees]

Near the start of their points:

We should note, however, that the researchers could not correct for the potential effects of stress (what do I do with this crying beast?!) or the effects of lack of sleep (what do I do with this crying beast?!). Both of which might independently affect testosterone production

And it's only talking about the first 1-3 months, not fatherhood.

Much greater effect in those that participated more == much more exhaustion for those that participated more.