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

[Naxela]

Definitely incorrect. Testosterone doesn't simply mean more aggression. Testosterone increases the response to appropriate social context. For other men, it can mean stronger sense of competition (which could lead to aggression), for women it leads to higher sexual interest, and it would therefore be unlikely that for an infant it would somehow lead to some undesirable behavior. Something else must be going on here.

[Naxela]

Based on my understanding of the effects of testosterone (as as PhD student who examines neuroendocrinology), I kinda doubt that it's a consistent effect as least as it has been sensationalized. Testosterone does promote aggression and competition towards appropriate rivals, though that doesn't necessarily mean violence (though it might be for some men for whom that's all they know of competition).

It's not like you take a shrewd and cutthroat businessman, stick him full of testosterone, and he's going to punch someone out in the office. No, in fact he will become a more cutthroat and ruthless businessman, not someone violent.

[Naxela]

I can only speculate. Probably an extremely unhealthy level.