My 3 week old boy just started grunting a lot. he does it when eating, when falling asleep, and when pooping. I wind him until I'm worried I'm hurting him, and he doesn't seem to be in pain when he is grunting, so I'm thinking it's just a baby 'thing' but does anyone else have experience of this? He's generally a chilled baby so not loads of crying, and I'm sure if something were wrong with him he'd cry rather than grunt? It's amusing in a way but getting a little bit annoying :) his poos are fine so he's not constipated. Doesn't vomit more than once every day. Sleeps 2-3 hours at a time.