They have already tried to steal women's thunder by claiming sympathetic pregnancies. Now men are claiming fatherhood sends their hormones into a spin. Research shows that levels of oxytocin, the 'cuddle chemical' released into the blood during labour, also rise in new fathers.
Fatherhood also brings with it a surge in prolactin, a hormone more commonly linked to milk production in new mothers. Both hormones were traditionally thought to help mother and baby bond. But these studies suggest men benefit from them too.
Researcher Ruth Feldman said: 'This seems to be evolution's way of helping men turn into good parents as soon as they have a baby.
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