My daughter is 6 weeks old and was born via c section at 35+6. She didn't need any extra help / time in SCBU and seems healthy overall. However I have been worried about her breathing right since she was born. Sometimes her ribs suck right in and belly bulges out - from videos online it looks like "retractions". It's almost like she is straining. She breathes like this about 20% of the time. At these times she also makes horrible grunting noises, almost like a harsh kind of snoring, even when awake. She also tends to breathe through her mouth a lot, especially when she looks like she is "struggling", and I understand that's unusual? Occasionally I see her nostrils flare but not a lot. She feeds perfectly now, despite some problems right at the beginning.
I've asked various midwives and the health visitor about this, and also took her to the GP who looked at a video of when she does it. They all basically said that babies do breathe in a very irregular way and not to worry unless she becomes cyanosed... But surely any problems would be quite advanced by then?
Anyway, last night I had no sleep at all because she was breathing very fast through her mouth, sort of panting. She was awake and seemed quite happy and alert, but I was too scared to go to sleep 
As several professionals have said she is fine, I really don't want to waste any more NHS time and resources if I don't have to - especially at the moment. I am thinking of getting a private consultation. Am I being paranoid or does this sound fairly normal for newborns? I am a first time mum but she is a twin, and her sister doesn't breathe like this. I have no idea how worried I should be.