Fatherly love

By Alison Motluk A PREGNANT woman is on a nine-month hormonal roller coaster—and it turns out that the father of her child goes along for the ride. Researchers in Canada have shown for the first time that expectant fathers’ hormones also fluctuate, and that the way they change mimics their partners’ ups and downs. During pregnancy, levels of several hormones rise in an expectant mother. These include prolactin, which triggers lactation; the stress hormone cortisol, which is known to be related to a mother’s attraction to her child; and the main female sex hormone, oestradiol. Immediately after the birth,
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