My four month old baby has constantly a full nose and cough a lot every morning. We use saline drops which helps also to remove a lot of stuff from his nose but it seems like the cold does not want to end. I was told that humidifer coudl help him but after a lot of researches, I am lost in the middle of the various types we can find on the market : cool or warm moisture ? Filter or no filter ? We have a small bedroom and use an add heater during cold nights , which I know does not help the dryness but he was sick before that.

Somebody has experienced hte same thing and could give me some advice ?

Thanks !