Child Tax Credit FAQ
https://ttlc.intuit.com/community/credits-and-deductions/help/what-is-the-child-tax-credit/00/25961
The Child Tax Credit is non refundable so it can only reduce your tax to zero. Then you will just get all your withholding back plus any refundable credits you qualify for like the EIC.
The Child had to be UNDER 17 on Dec31 to get the Child Tax Credit.
