DS is in reception, one of the youngest in his class and if i'm being honest young for his age too. I have overheard a few of the kids calling him a baby (quite innocently tbh) but it worries me. He is very small and he still talks very babyish and cries easily. My older DD 8 is autistic but my DS is very different. He isn't where he should be academically but I really do feel it is because he young for his age. He can write his name and is starting to read a little bit.
DD is never invited to parties but my DS has been invited to 6 this year although mainly by girls. I thought this was a good sign he is doing well socially although I did observe at the last party he seemed very much on the periphery of the group. He was doing all the running trying to get people to play with him - he was desperate to play with the boys but they did not seem very interested in him. Last week was called into school to watch him being presented with an award. They said he was being rewarded for being so kind (apparently he is lovely with a little girl who has quite a lot of disabilities),they said he is a wonderful friend, lots of the children like him because he was so fun to be around etc ... I was thrilled to bits watching it.
However, he comes home and says children are not playing with him, 2 boys that he wants to play with run away from him when he tries to talk to them, he says one boy is evil to him as he accused him of lying 
I wanted to give him a party in August. He says he would like a party but only wants to invite his 2 cousins and dd's one close friend. I asked who he plays with at school - he says nobody. I have asked which friends he wants to invite from school and he can't name anybody. Advice as I am perplexed?