The “male” hormone testosterone, known for fueling violence and aggression, has been shown by studies to drop around 30% following the birth of their children. This was shown with a sample group of 600 people who were tracked for almost 5 years. In cases in which men entered stable relationships and then produced offsprings with a steady partner are the ones in which the drop occurred.
Fascinatingly, the most significant drops occurred in men with the highest initial testosterone levels, and these high testosterone men were the most likely to produce offspring. This shows that the pair bond between males and females of our species (backed by a drop that happens following the creation of a partnership) suggests that we evolved in a way to support the pair bond.
No more does the excuse that “i’m a man, and men aren’t supposed to do that” stand. Men are just as wired as women for childcare and childrearing.