You will claim your child who was born in 2020 on your 2020 tax return and use the recovery rebate credit to reconcile the amount of stimulus received. There is no other way to "update" the fact that you had a child in 2020. And....wait to e-file until late February so that all of the stimulus money goes into the 2020 refund. The IRS will need time to change the forms for the 2nd stimulus.
**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.**
