No, you cannot call and amend over the phone. You have to prepare and file a Form 1040X in order to amend your tax return. You will need to go to My Info and change the way you answered some questions about your child.
Make sure you have entered your child as a dependent in My Info, and that you have entered the child's Social Security number. Careful— do not say that your child’s SSN is not valid for employment. If your child was born in 2021 make sure you said he lived with you the whole year. There is an oddly worded question that asks if the child paid over half their own support. Say NO to that question.
You will need to go to the child tax credit so that you get that credit for your child, and you will need to go to Federal Review in order to get the recovery rebate credit for your child.
See this TurboTax support FAQ for amending a tax return - https://ttlc.intuit.com/turbotax-support/en-us/help-article/tax-return/amend-change-correct-return-a...
**Disclaimer: Every effort has been made to offer the most correct information possible. The poster disclaims any legal responsibility for the accuracy of the information that is contained in this post.**
