Babies know their mothers at birth because they know them before birth. This we know as a fact.
No, we really don’t.
Yes we really do, but you don't believe this to be true. That's fine. You refer to what we know to be true as 'woo'. Ok. I can refer to scientific studies but there would be little point if your general approach is to ignore the studies already provided to you. You would simply dismiss them. You have your own 'facts'.
I would agree that the bond formed in the womb, develops further outside of the womb, but I would disagree with your view that it isn't there are birth.
Even if I was willing to dismiss or reject the decades of research on attachment theory or even say that babies aren't harmed by being removed from their mothers at birth in broader terms, as a concept, there is also the matter of what we know based on experience (as well as what is supported by scientific research).
There are, I'm guessing, hundreds of comments on Mumsnet and other platforms about a woman's experience of labour affected her newborn and how her baby would cry incessantly when he or she (or they) goes to their father or another relative, only to stop when held by their mother, or about how if a baby is passed around visiting relatives or friend she then can't settle her baby or feed at night them because they are so upset and have spent too much time away from her. I wonder how much time you have spent listening to mothers or if you have been so steeped in the view that surrogacy is socially acceptable that you have any real experience to refer to. I say this to engage as I'm genuinely interested. Do you consider babies to be a blank canvas? I ask as you already believe that there is no connection at birth so I wonder what you know about traumatic births or widowed fathers for example? Coping with newborns whilst the mother is being operated on or worse.
I would strongly recommend reading The Primal Wound, though I fear you are too closed minded to consider an alternative view, but I say this as it might help you to at least understand where other people's opinions differ and why.
I would make a promise in return to read any reasonably priced book on the subject of how babies aren't connected to their mothers at birth with one caveat, as long as it's not Full Surrogacy Now by Sophie Lewis.