If you do not get the advance payments now you will be able to get the full child tax credit when you file your 2021 tax return next year---assuming you are eligible and have a qualifying child under the age of 18 at the end of 2021.
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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