My little boy is 3 weeks old and he is combination breast milk and formula fed (all from bottle, he is too damn lazy to breastfeed!). He's always been a little difficult to wind but usually gives it up eventually. We didn't have a problem until about 3-4 nights ago when he suddenly refused to burp at all and after about half an hour, we would lie him down in his Moses basket and he would posset several times and then be sick. He has become quite distressed and crying, which he never has been before, he's a very content and laid back little chap usually but it looks like he is in pain, his stomach is rock hard. We've been massaging his tummy, giving him cooled boiled water and started infacol. The infacol has made him easier to wind but he is still getting this pain and hard tummy. When we give him water, he generally does an enormous, loose poo not long afterwards.
He was in SCBU for a week when he was born and NBM for the first 3 days. He was bottle fed when he first started feeding and I've struggled to establish breast feeding with him. I'm still expressing and he's having breast milk and formula from the bottle. As far as I know he isn't tongue tied although I wouldn't be surprised if the hospital hadn't told me this!