How is the feeding going so far?
O seemed colicky and unsettled/uncomfortable shortly after birth, I was still in hospital. A mum in the next bay suggested that had colic but I just smiled and nodded whatever. Turned out he had a tongue tie and his particular latch meant he was taking in a lot of air. Even burping him didn't always work.
He still wretches on what sounds like silent reflux too often for my liking

Have you checked for tongue and lip ties? *paranoid*