Playdate, playdate, playdate... To the point you and the other parents are
good friends, then the two kids will be best friends. My son is very shy but
he made his only best friend so far this way. Now at 1st grade students are
mixed again, he's still playing with that old friend at recess. But I trust
over time we can build relationship with another family in his current
class. I just asked my son yesterday, he said he's happy all day long and
nothing to be sad or unhappy about, and he likes recess the best. That's all
I want.
His school has a lot of Chinese so he had one best friend in the past that
is Chinese too. But our kids shouldn't be limited to Chinese friends only.