The portal to enter how many children you have, etc. should be functional by August. I suspect the first round of these payments will get off to a rocky start and that it will take patience until they get it sorted out.
IRS link
https://www.irs.gov/credits-deductions/advance-child-tax-credit-payments-in-2021
See Manage Payments
(Another thing----will anyone turn 18 before the end of 2021?)
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