The bonding (through skin and eye contact) between mother and baby after birth stimulates in both of them the feeling that they belong together, a feeling of oneness that ideally has been growing from the time of conception.
Just now I had a conversation with a nurse. She was telling me about the pain and the difficulties of her child delivery. After a few interminable, painful hours, they went for a c-section. Her baby was the last thing she wanted to see when the procedure was done.
I don’t believe this is due to a trauma in the nurse’s childhood, rather the trauma of giving birth - that also needs to be recognized and elaborated.