I had an awful time giving birth to dc1 (including lasting birth injuries to me), followed by great difficulty breastfeeding and PND.
I did not realise just how much I had been traumatised by the birth, until, very late in pregnancy with dc2, a midwife picked up on my emotions during a group ante-natal class. She took me aside after the class and made me an appointment with a specialist midwife.
This midwife sat with me for 2 hours going through the hospital notes from my first labour. She was entirely accepting of my confusion, distress and anger. It was a relief not to be told "Baby's fine, and that's what matters." It was a relief not to be talked down to. The midwife explained why things happened and where things should have been dealt with differently.
Most importantly for me, she gave me explicit permission to say "No."
Obviously I already knew that I did not have to just accept anything any HCP wanted to do, but it can be extremely difficult to advocate for yourself in such an overwhelming situation. Especially if you feel you have to justify your "No". And while dh did try to advocate for me, it was completely new and overwhelming to him as well, and all he wanted was for me and the baby to be safe.
I went into the second labour secure in the knowledge that it did not have to go the same way as the first. That I had more control over my environment and my treatment than I had thought.
As it happened, when I arrived on the labour ward, the exact same midwife team was on duty as with my first birthing. I said to the one midwife that I remembered caring for me with gentle, firm kindness "I do not want X to come anywhere near me. I want you to look after me." And she did. I did not see X again. My request was accepted without any justification required.
The birth of dc2 was hard work, but not distressing. I felt supported and listened to. I tore again, but this time was treated like a conscious human being while she stitched me, rather than like a piece of meat (I had been stitched by a different person before).
I can honestly say that that second birth wiped away the trauma of the first. I still struggled to establish breastfeeding, but had no PND. Subsequent births were even better.
I do not honestly think that the trauma or otherwise of the labour has any influence on how quickly I felt bonded with my baby, or the overwhelming love for them. In fact, with the easiest birth of all it took me the longest to feel the bond and the love.