The IRS portal will be ready later in the summer so that you can add a child who was born in 2021. That portal is not yet ready. You will need the child's Social Security number.
https://www.irs.gov/credits-deductions/advance-child-tax-credit-payments-in-2021
https://www.irs.gov/credits-deductions/2021-child-tax-credit-and-advance-child-tax-credit-payments-t...
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