Isn't the attachment between mother and baby made in that "golden hour" after birth?
No. Attachment is a process, not a one time thing that happens in an hour. It begins in utero and continues throughout the child's life, developing most strongly in the first two years.
Removing newborns from their mothers sometimes has to be done, to protect the child. There are many accounts of adoption trauma in people who never even experienced neglect as they were removed immediately. Of course many children don't experience discernible effects from this separation - there are many factors.
Creating a baby deliberately to remove it from its primary attachment figure at birth is the ultimate in capitalist, individualist commodification of women's reproductive labour and of children's lives and it's horrific.