My 2 1/2 year old son has a little runny nose, a wet cough. he seems to breath with a noise as he breathes. its hard to explain but he fully active.?

Nasal noise: The nose & upper airway of small kids is a bit rubbery & vibrates when additional air is moving through with a cough or deep breath.This can produce lots of odd sounds/squeaks. The inner membranes of the nose can swell & constrict the nasal passages increasing the noise & vibrations.A kids general play activity is a good gauge of how sick they are, so this sounds minor.