So basically your son might cry sometimes at school. Even in 2nd grade this probably won't be that big a deal. It isn't due to immaturity, it's due to him being 'aware beyond his years' of things. You can work with him to teach breathing techniques, or just brainstorm his ideas how to 'not cry' during school while validating the 'strong feelings.' You can talk about times when you felt a very strong urge to cry but didn't because in some way you put the needs of the situation first. You can point out to him how much money is in 'tear-jearker' movies because everyone wants to cry a lot more than they do.
DS7, grade skipped, and in 2nd cried this past weekend at a birthday party, over something so small. Part of it reminds me that he is the youngest and not quite as mature. Part of it is his sensitive nature. He is probably far more mature in school than at home - circumstantial maturity? The issue was something that DH and I had said to him, and I wonder if he really would've reacted the same had a classmate said the same. Probably not.
There are reminders of his immaturity, but also those that confirm he's not quite the same "little kid" away from us.
