Proof that your wife's pregnancy and your new status as dad does indeed mess with your head (in a good way!):
"[Hormone changes related to partner's pregnancy] also change his perceptual circuitry, increasing his ability to hear a baby cry, something many men can't do very well before their wives are pregnant. And a word to the wise for all the young mothers who are reluctant to let your husbands hold and care for your newborn. The more hands-on care a father gives his infant, the more his brain aligns with the role of fatherhood. So, hand over the baby."
Read the whole story here