I know we just had a thread on something similar but I couldn't find it when I looked.
I met up with a former co-worker today for lunch at a national chain restaurant. She just had a baby and she brought him with. He was adorable and she looks just exhausted. For background-she's a first-time mom, her husband travels for work for weeks at a time, and all her family lives far away.
After we were done eating she announces the baby needs to be changed and picks him up out of his carseat thingamagiggy (I don't have children and rarely come in contact with them). I say okay and tell her I'll watch her things. She looks at me quizzically and asked what I meant while she laid him on the seat and began to unsnap his outfit.
All I could think to say was, "I don't think you can do that here!" She asked me why and I said I thought it was a health code violation. She told me not to worry and that she was sure the restaurant would wipe down the seats later.

I guess the look on my face at that comment clued her in because she said the baby had only peed so she'd wait til later to change him. She said she'd call her Mom later and ask about the health code violation thing because her Mom works in a daycare.
My question is even if it is not a health code violation I don't want to see it, what do I say if it happens again? Trust me in that I can't be blunt and tell her it's disgusting. She looks like she's close to breaking down as it is and I'm trying to tiptoe around her. Any good advice on what to say? Blame a weak stomach?