My DD is 7mo. She goes to nursery for only 3 hours a week. Today the lady who runs the nursery told me that 2 of the boys who attended the nursery were off this week due to having croup. I've never heard of it before but she said that it looks much the same as a cold but if DD had problems breathing I should sit her up and phone an ambulance. 
She also told me that it was strange that the two boys had got it because the 2 boys had been doing opposite days for the last 2 weeks so not seen each other. Also with each of the boys the symptoms came on suddenly. eg. "They were happy and well at nursery and then the next day I get a call that he was hospitalised last night".
Phoned my mum for advice and although she had heard of it and vaguely knew what it was she didn't know much. She just suggested putting the travel cot in my bedroom tonight so that I could keep an eye on her for my own peace of mind.
I was wondering what others knew of this illness - am I worrying too much? Half term now so DD is going to be at home with me so she won't be exposed to anything now but was wondering how long before I can stop worrying.
PS - sorry I put it here.. couldn't really find anywhere else to put it...
TIA