My DD had a really croaky voice and cry last week too, also a mild snotty cold. It developed in to a really hacking cough quite quickly, and the doctor diagnosed it as croup... Croup can occur when they get an inflamed larynx/windpipe...
I hope it doesn't come to that with your DD, but just keep an eye on her if she does get that cough. Luckily my DD coughed while we were in with the doctor and she could diagnose it quickly. Was easy fixed with some drops.
Bookmarks