Can serious respiratory infections evolve from a cold?

My daughter has a cold, and I was wondering if it could turn into the flu, pneumonia, or brohncitis, or anything like these. Or do these more serious respiratory infections start of as itself and not a cold. I just want to know cause I have read some horror stories lately about respiratory infections that became... show more My daughter has a cold, and I was wondering if it could turn into the flu, pneumonia, or brohncitis, or anything like these. Or do these more serious respiratory infections start of as itself and not a cold. I just want to know cause I have read some horror stories lately about respiratory infections that became fatal and I'm all worried.
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