Should they have told us they were ill?

Of course they can catch colds anywhere BUT it’s easier to avoid when you stay away from someone that’s knowingly ill. I would be beyond angry!!

I feel like they should've said something so that you could've made an informed decision. Yeah, babies can potentially catch a cold wherever, but this one feels like it might've been preventable.
I'm sorry your baby is going through it, it's no fun to see your baby sick.

Regardless of ages involved, you always warn someone visiting that someone is sick within your household. Its called being considerate and is also a common courtesy.Then your guest can choose if THEY are willing to risk it or not. Most will come anyway if you give them a heads up. Others usually have their reasoning for not and that's perfectly fine, regardless of what that is.