We recently went to a birthday party (nursery friend). We stayed for an hour and a bit. For the first hour, my three year old would not leave my side. Sitting on my lap for activities, holding my hand while walking from the activity area to get a piece of cake, not engaging or talking to his nursery friends. He knew c. half the kids from nursery. It was small-ish and low key. Very relaxed. We got there a little bit late, so everyone else was doing something as we arrived. It was only in the last ten min or so after getting a balloon that he started to warm a little and play with the others. He is fine at nursery. Has a group or friends as far as I know, says he is happy being there and usually says that he has had a good day. I have seen him timid or shy before at birthday parties or at the playground - everyone else will happily go down the slide, but he is scared to do so. I try to support him as much as I can, telling him that it is absolutely fine to feel shy/ not wanting to go on the slide. But I do worry about him. I want him to have a good and happy life feeling on the inside rather than the outside of friendship groups. Anyone with similar experiences? Advice? Happy endings? AIBU to be worried?