Not too much you can do. My baby had a cold as well. We just run the cool mist humidifier at night and in the morning we put baby saline drops in her nostrils and suck them out with a nasal bulb aspirator. I would also take her into the shower with me so the steam could help her.
Re: Baby congestion?
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We use a humidifer and nasal drops. Both seem to help some.