Any help appreciated, my fifteen month old son is making funny breathing noises and we can't work out if it is just making noise for the fun of it or if it's something we should get checked out.

He breathes heavily in then out making sort of light squealing/wheezing noises for a few breathes then stops..... then it wont happen for a while.

He's not doing it at night only during the day while playing etc...

Any thoughts?