6 month old and cold

Sarah
My little girl has a phlegm cough but no other cold symptoms no fever no runny nose... she's getting plenty of milk, rest and she has a humidifier in her room
Doctors office says I'm doing everything I can and to bring her in if symptoms get worse and/or develop 
She doesn't seem to be wheezy or have any breathing difficulties ... is this just a mild cold ? 

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