IRS has a Child Tax Portal where you are able to enter the information for the new child that you will claim on your 2021 tax return. If you do not receive advance Child Tax Credit payments for a qualifying child you will claim in 2021, you may claim the full amount of your allowable Child Tax Credit for that child when you file your 2021 tax return.
Here's a link to the portal:
https://www.irs.gov/credits-deductions/child-tax-credit-update-portal
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