Well, it’s finally official: fatherhood puts a damper on testosterone production. This isn’t exactly new-news–I wrote about it in the “Daddies” chapter of my book, Birth Day. But previous studies had a chicken-and-egg problem: no one knew if fatherhood itself somehow depressed hormone production, or whether men with lower testosterone levels were simply more likely to want to become involved fathers in the first place.
Now we know.
The cause? It isn’t clear yet, but it could be due to stress, interrupted/nonexistent sleep, or some other factor. I suspect pheromones–sneaky chemical messengers that waft through the air from a baby (or his mother) to father–designed to keep the big lug involved with his kids. Sounds like a win-win to me: good for babies, good for daddies.