My 7 week year old started coughing today. It started out once or twice every 2-ish hours. When I fed her at 11 pm she did several in a row. The cough is dry and she doesn't do it while she's sleeping. There has been some sneezing too, I think some nasal congestion. Should I be concerned or will it pass with time? Also, is there anything I can do to help ease the cough or sneeze?