To ask at nursery if there's a reason my son gets left out

[polkadotsrock]

Long story short...for the second time in recent months my wee man has been overlooked for a birthday party. Problem being the teacher hands out invitations at the door so when there's a queue and everyone gets a letter but then he doesn't he obviously notices, though he isn't upset. He's only 3 and it could be that the party is for children who will be attending school later this year and been together at nursery for longer but it seems hurtful to me. Or am I too sensitive and it's perfectly reasonable to not invite all children and for the teachers to hand out invitations rather than just more discreetly place them in the childrens bags? I feel like I want to ask if he's settled ok, just started funded place every afternoon but has been going 3 days a week since September, but don't want to make a fuss unnecessarily. Guide me please...

In my experience at nursery / preschool it's more about which mums socialise with other mums, coffees and chats and pick up (less so in daycare); play dates follow on from that. My children didn't get a huge number of invitations but I work part time, didn't pick up every day, and didnt tend to stand chatting in the line to collect.
School is much more inclusive in my experience.

Yes agree with that Mrs TP.

I've picked him up and casually enquired into whether he was fitting in. They've assured me all is well and no issues. Will let it lie a bit then check the class list, don't want to ask too much at once!