I am happy to take the consensus on this one - it didn't occur to me I might be but their reaction has made me think...
I was in a hospital waiting room with my baby and an older than me couple walked in with their baby of approximately the same age.
She asked me if my baby had something wrong with her eyes, which i was a bit surprised with as we were in an eye clinic (plus it was a blunt first question I thought - didn't mind it just surprised me) but I said that I wasn't sure but that I hoped not.
I asked how old her baby was and she told me and then she said the Dr thought he had a squint which is why they were there but that she thought it had rectified itself. I said that I'd heard that can happen and then I asked if she had other children.
She then turned on me and without answering and in quite an agressive tone asked me if I had other children and why was i asking her that.
I explained it was just conversation and that yes i did have other children and just then we were called to see the consultant and off I (gratefully) went.
So - it made me think that perhaps i shouldn't ask people ever if they have other children incase there's a sad story as to why they don't and it makes it hard for them. Or - is it ok to ask?
I really didn't think when I asked.