The poor little guy. My oldest and youngest get croupy coughs. We had it in October, at that time my daughter was 10 months. We've had it at least 3 or 4 times before that with my older son.
Croup is worst the first 3-4 days. It is called a self limiting virus, and will go away on it's own without medication. The steroids help with the swelling of the vocal chords - which is what causes that horrible cough and "stident" breathing (gasping and wheezing).
***One more thing we do with croup, is to take them outside for cold air on their throats. That also helps with the swelling, and can prevent a trip to the emergency room in the middle of the night. In Oct., we were out at least 3 times over night with my daughter.***
Unmedicated, the barky cough usually is worst for a few nights. We've had croup on several occasions, but usually just let it run it's course. This year the kids seemed sicker than in the past. So, we opted for steroids this last time around since they were SO sick. It helped them sleep much better, so I'd do it again. I didn't notice any harm to their immune systems, but the lingering cough from croup can last up to two weeks after first getting sick.
Croup is contagious. Some kids are more susceptible to getting it. Basically it is a virus that attacks the vocal chords, causing swelling and the barky cough and difficulty breathing. My 3 kids were sick at the same time, but only two of them had the croupy cough. My middle child just presented with bad cold symptoms.
Prevention of croup is the same as any virus, washing hands, etc.
Get rest, drink fluids, and re-cooperation are the best things you can do.
Jessica