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Dads' hormones change, too, during pregnancy

As Lance Somerfeld learned, babies are excellent teachers. His son provided round-the-clock on-the-job training, free of charge.

Within days of becoming a father, the 36-year-old New York City resident learned how to soothe a fussy baby. How to burp him, feed him and swaddle him.

Yet in some ways, Somerfeld's son began shaping him into a father even before delivery.

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.

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