Thank you!
A real friend is one who walks in when the rest of the world walks out. - author unknown
Any of the croup remedies could potentially help- but no certainty on any of them. If you know what has worked in the past, then try that one. There is a whooping cough prophylaxis nosode too.

Can someone tell me if SPONGIA TOSTA would be a good preventative for croup?

Thanks
A real friend is one who walks in when the rest of the world walks out. - author unknown