Since December is already upon us, just wait and add the dependent to your 2022 return.
How to Claim This Credit
You can claim the Child Tax Credit by entering your children and other dependents on Form 1040, U.S. Individual Income Tax Return, and attaching a completed Schedule 8812, Credits for Qualifying Children and Other Dependents.
If you received advance Child Tax Credit payments in 2021, find out how to compare (reconcile) your payments to claim the rest of the Child Tax Credit on your 2021 tax return.
https://www.irs.gov/credits-deductions/individuals/child-tax-credit
