My 6 year old DD (coming to the end of year 1) has always been very emotional. If she gets disappointed at home she will quite often get tearful - I wouldn't say it's like a tantrum as in she's not doing it to get what she wants, she is genuinely overcome with emotion and will quite often take herself off to her room for a bit of a cry. She usually recovers pretty quick. I talk to her a lot about how it's OK to be sad, and sometimes we cry when we're sad but if we can try and take deep breaths/count to ten and keep calm it's easier to try and resolve the problem. I'm not too worried about this as I assume she will grow out of it, I can see it is getting better.
However, I have noticed this happening at birthday parties with her friends. They will all get a bit grumpy with each other at times, I guess 6 year olds can still be pretty self centred if things don't go how they want. It will be silly little things like disputing who won a race or who should be a particular character in a game. They can all be equally argumentative but she often ends up in tears where as her friends will grump at each other a bit but don't really get so emotional. It doesn't always happen and is worse if she is tired. Obviously I don't know if this happens at school, but imagine the excitement of parties makes it worse.
At the moment it isn't causing her a big problem - she has a nice group of friends, gets lots of invitations for playdates and parents always comment on how polite and friendly she is. Most of the time she plays nicely and treats her friends kindly. But I do worry as they get older it will put other children off playing with her, or she'll get a reputation for ending up in tears.
Just wandered if anyone has any experience of this and if so how you dealt with it, whether it resolved itself over time.