I have 2-month old and before he was born lot of people said to me that "dads can't do much in the first 6 months". I was like ok, we'll see how it goes.
After he was born, I quickly realize dads can absolutely do everything except feed the baby directly from the breast. Breastfeeding itself, depends on the baby and mom, is fairly quick, maybe like takes 15mins every few hours. That leaves about ~22 hours each dad can be part of the activities, like changing diapers, bathing, soothing, having the baby sleep on you, putting the baby to sleep, reading, changing clothes, singing etc.
This "dads can't do much", "there is just this bond with the mom" and "it's biology" seems like bullshit or an easy out from taking responsibility. The bond happens if you just spend time with the baby.
Society is making way too many excuses for men to avoid raising their children, and it really needs to stop.
It should be easy for women who wish to be with their babies and breast-feed them to do so.
It should also be easy for dads!
BTW, I'm about two weeks out from becoming a father. I only get 2 months paternity leave, but if I were the mother, I'd get 4! This seems unfair to me, but it's certainly better than if the policy were reversed.
It seems like there's just some built-in conflict between an intensely competitive capitalist society and the human needs of a family. I might do something like mandatory 4 years leave (in 1 year chunks) for all people, spread out from 20 to 40. You can spend that being with your kid, doing some sort of civic-project, or serving in the military.
Just spitballing'. Always fun to try to design a utopia. :-)