Capital loss carry over credit

Your capital loss part of calculation of your AGI which in turn determines your tax liability. Credits are then applied toward that liability. 

The capital loss carryover is not a credit that reduces your income tax.  It is a loss or negative income amount that reduces your income.  If your income was reduced low enough so that you did not have any taxable income, and therefore no income tax, then your child tax credit could have been affected.  

These items are subtracted and calculated in a certain order based on the tax return itself and which line the items are reported.  There are no changes you can make to change the outcome.  

@jpetersenbus1 

it's not a credit but a deduction that reduces taxable income