For the child tax credit, the Trump campaign never released specifics (shocked that they lack detail… absolutely shocked), but both Vance and Trump have stated multiple times to the affirmative that they are in favor of expanding the child tax credit, and Vance floated a number of $5000 per child. Here is an AP article discussing:
Never before in a presidential election cycle has there been so much discussion of the child tax credit — a tool many Democrats and Republicans have endorsed as a way to lift children and young families out of poverty.
apnews.com