回复:回复:绿卡排期影响专题讨论:对孩子上大学的影响,有经验的前
If you have submitted 485 for your child, now he is H-4, after his 21th birth day, I think he can get a "485 pending" status and once your GC approved and his GC should be also approved.
Ask your attorney for sure.
God bless you!