Holly, a good hossy will tell you to bring baby down as they are due for a feed.
Breastfeeding is a great comfort to babies even if they dont end up crying it ill make him feel secure.
I sat on a couch and breastfed DS (football hold) and she *****ed him from behind me.

He didn't flinch and just kept on enjoying his boobyjuice.
As for the injection after birth, pfffft he didn't even need to be feeding he didn't care!!
He has never been much of a crier when it comes to needles.