I am not sure how much money is going to Mexico either but any amount is too much.
There was a case where about 6 or more child credit payments were going to one household where only 2 kids lived. Money for the 4 or more was resent to Mexico. I doubt that is the only family doing that.
The child credit is a scam. A proper deduction is the only fair way.
If you claim a higher number of kids for a deduction, isn’t it the same thing?