Yes, hengcs, let's list:

the two children in The Children of Heaven
the little boy in Cinema Paradiso

I have thought of a few more:

Mohsen Ramezani (the blind boy) The Color of Paradise (Iran)
Bertil Guve -(Alexander) in Fanny and Alexander
Dean Stockwell - The Boy With Green Hair
Lukas Haas - Witness
both children in The Children are Watching Us -De Sico
Mark Lester - Oliver
Ricky Schroder - The Champ
both children in - The White Balloon (Persia)

And OF COURSE Ron Howard as Opie in all those early Andy Griffith shows!

Sara