Wad should i use or wad to do to make my 5mth old baby breathe better? He has flu. Seems to get blocked when slping in aircon room. Use vicks vapo rub apply on baby's chest?

I use sterimar nasal spray. Good and effective. Clears up the nasal. If he is blocked you need to suck out the mucus. That will provide some relieve for him. As much as possible to sleep with fan, fan will provide ventilation.