Yes, you can, since you've gotten your refund.
You’ll need to file Form 1040X for your amended return, which TurboTax can do for you..
Please see the TurboTax Help article How to amend (change or correct) a return you already filed for instruction on how to amend your previously-filed tax return.
The third Economic Impact Payment in 2021 did not include payments for children born in 2021, because it was based on information from your 2020 or 2019 tax return. However, you may claim a 2021 Recovery Rebate Credit for them if they are a qualifying dependent and you’re eligible for the credit.
You may claim a 2021 Recovery Rebate Credit for the qualifying dependent, if you’re eligible, on your 2021 tax return that you will file in 2022.
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