Quick advice please - rotten milk

[Rottenmilkcup]

2.5 year old's munchkin cup went missing last week I can't remember exactly when but around 5 days ago possibly more. She has just came into my bed and I hear her gulping her drink, assumed it was her cup of water, nope it's the munchkin cup with milk inside. How bad is this likely to turn out? Can it have done any damage? I'm really worried would appreciate any advice.

What's a Munchkin cup? I don't think you need to worry too much OP...the worst it could do is give her a bit of a stomach ache. She couldn't have drunk much as the taste would have stopped her in her tracks surely?

It’ll be fine. It is an actual drink that people have on the continent. You just leave milk out for a few days, it separates, you give it a shake and drink. A bit like yoghurt.