@Veronica thank you there was a tiny bit left in the bottle and it hadn’t curdled or gone lumpy but I just felt terrible! X
Don't feel terrible things happen honey, we are human. Just keep an eye on him but he will be fine. Plenty of water today :)
I agree, it should be fine. If he does have a little tummy trouble, he'll be okay after a day or so. Sounds like it still tasted good, or he wouldn't have drank it!
I don't think one off thing would be a problem. Unless it's very very hot in there I wouldn't worry, the worst it can happen is some tummy ache maybe diarrhea things like this but it should resolve by the end of the day.