My #2 she makes grunting noises when she fidget, which is normal. They have a small nose, hence when they breathe it does make that noises. It will go away after few months old. Which in this case for my #2 is like after 3 months.
Hi my baby does the same too! I think it’s fine as long as baby is not in pain. What worked for me is swaddling & pacifier :)