I don't entirely agree with the wifework comments.
This is not something like tidying the house - a thing that was traditionally seen as women's work but actually that's totally cultural, nothing to do with biology.
Having a baby is biologically "women's work" - by that I mean the physical work of growing a baby inside you, delivering that baby and - if you don't bottle feed - then feeding that baby from your body.
And the thing is, we are not robots. Our body is not a machine, unconnected from our mind and feelings. They are part of a person with strong instincts and emotions that are affected by hormones and our brain's knowledge of what is happening inside us.
As we grow the baby inside us, we do prepare for the arrival of the baby in a way that non-mothers (not just men, anyone who is not growing that baby inside them) do not.
A funny thing happened when I had DS. My mum met DS when he was less than a day old. And she asked me, "how do I hold him?".
On the surface, a very odd question for a mother with experience of raising two grown children to ask her DD who had less than a day's experience of being a mum to a baby.
But do you know what? It didn't seem at all odd to me at the time. I instinctively knew the answer, I showed her how to hold the baby. I felt utterly comfortable holding my own baby in a way I hadn't with my friends' newborns. That must be instinct surely? I'm not saying everyone has it or feels it, but that we shouldn't be surprised if women take to parenting in those early days quicker than men because a. our bodies have prepared us for it and b. we have a more immediate role (breastfeeding) that we just need to get on with, and which creates bonding.
To pretend that men and women are equal when it comes to parenting very young babies is to deny the huge amount work we as mothers do, and our bodies do, to bring our DC into the world. As the babies get older and less dependent on us then yes the ideal is it becomes more balanced and there's no reason parents shouldn't be able to parent equally.
But the first few months? They're the fourth trimester aren't they? Biology not only culture determines that our roles are different as parents.
Also, as women are visibly about to have a baby, when we're pregnant we get people talking to us about babies all the time. Men less so! It's not obvious when they're not with us that they're about to become a dad so they don't have people reminding them / discussing it with them all the time, like we do.
That said, of course there are some lazy fucker / misogynist men who shirk their responsibilities, I'm not talking about them.
But I'm quite comfortable with the idea of helping my partner learn about what I need him to do to support me as a mother in those early months. That's not instead of him doing his own research, but as well as.