A new study found that men show shifts in behavior from mating-oriented to parent-oriented while their partners’ pregnancy develops. These changes are determined by changes in testosterone levels across pregnancy and hormonal linkage with their partner。

一项新的研究发现，在伴侣怀孕时，男性的行为会从交配导向型转变为家长导向型。决定这一转变的是伴侣怀孕期间男性睾丸素水平的变化，以及他们与伴侣之间的荷尔蒙联动。

It’s almost hard to imagine that every caring dad was once a skirt-chasing ball of hormones — but it’s true. Somewhere along their transition to parenthood, biology puts a stop to men’s carefree days of sowing wild oats and turns their attention towards nurturing children. This is a very solid strategy from an evolutionary point of view, but we didn’t know exactly how it happened.

难以想象每个慈爱的爸爸都曾是一团追逐女性的荷尔蒙——但这是真的。在转变为人父的过程中，生物机制使男性结束了逍遥自在、四处播种的日子，并将注意力转到养育孩子上。从进化的角度来看，这是一个非常可靠的战略，但我们并不确切知道它是如何发生的。

A new study found that the answer may be testosterone. While high levels of this androgenic steroid hormone have been associated with aggression and competitive behavior, lower levels promote nurturing behaviors, particularly those related to caring for offspring.

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