could be 2:
-he is in a new environment, with lots of kids arround him, but NONE is his friend (his friends are the ones the left back in his old school), so that's why he may be a bit pushy to interact with other kids
-and his age where, where he absorbs all the not-to-be-done things...

I am just concerned about what I can do. That's why this thread to see other opinions.
Thx.