DS is 4. He is also coeliac.
In a cafe, while I was in the loo, apparently. Friend was giving her own child a sip of coffee, and offered DS one too. DS said 'Is it gluten free?' Friend said 'Yes', and gave it to him.
I don't think you should give other people's young children coffee, but especially not when they are coeliac. Friend could not have known if the coffee was safe. Even a tiny sip of anything that has been contaminated will cause damage. It wasn't her decision to make. Before I went to the loo, we had just been discussing the difficulty of ensuring safe food (I brought food for DS to the cafe, he didn't eat theirs).
I only found out several days later, when DS mentioned it. This may explain the tummy ache he had for a few days.
It just makes me feel very upset. I work so hard to ensure that DS has safe food, and there is still a long way to go before all his pre-diagnosis damage is repaired and he's back to full health.
Unlikely to see this friend again for a long time (we were visiting her town, which is a long way from ours) so may not be worth raising with her. It's just another worry. I've already had the 'always ask if something is gf' conversation with DS, now I will have to have the 'who can you trust to give you an accurate answer' conversation too.