My son has had 3 colds in the last month. The last two have been one on top of the other so he has been sick for 2 weeks straight. No fever, but drippy nose (and crazy snot in the snot sucker). Some occasional sneezing but otherwise ok. I'm starting to get a little concerned as he has had one cold or another for literally 2 weeks now. Doesn't that seem like a long time? Any suggestions?