I had a birthday party for my 5yo in a soft play area. 3 parents told me they were leaving children and would pick them up later, so i took parents phone numbers. Another parent told me weeks after the party that they had left their 4yo at the party and gone shopping. I looked a bit surprised. But she said it was fine cos the kids can't get out (they can as all that is stopping them is a gate with a latch on and anyone can leave it open accidentally). And she also added that the party only had people from the party (28 kids + over 30 parents so very easy for anyone from outside to come in unnoticed). I'm not going to bring it up with her. It is her child after all, but I was just curious to see if you lot think this is normal ?