I have read that when a woman gives birth vaginally, the process of the birth releases hormones and these hormones contribute to the feeling of attachment to the bub

I wonder how much of these hormones are released when labor is interrupt or when there is no labor as in the case of a planned c-section?
I'm curious about this too. I have always loved my DS, but didn't feel overwhelmingly attached to him in the beginning. Bonding properly took a while.