Congratulations on your new little one! The good news is you do not have to wait until you file your 2021 tax return to get the child tax credit. You can use the IRS portal to add a dependent that was born in 2021.
https://www.irs.gov/credits-deductions/child-tax-credit-update-portal
The IRS does expect this feature to be added to the portal by late summer. Refer to Q A16
https://www.irs.gov/credits-deductions/2021-child-tax-credit-and-advance-child-tax-credit-payments-t...
Again, congratulations!
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