From USA TODAY:
…Although men may not be aware of it, they actually undergo hormonal changes as they prepare for fatherhood, says neuropsychiatrist Louann Brizendine , author of The Male Brain (Broadway Books, $24.99), released in March.
About three weeks before the baby arrives, levels of testosterone — sometimes called the “male hormone,” associated with competitiveness, aggression and sex drive — fall by roughly a third, Brizendine says.
That may have helped the species to survive, she says. A human baby needs two full-time caregivers — maybe more. So a baby is more likely to survive if Dad is at home to help, rather than out looking for new romantic conquests, she says…
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