2021 Child Stimulus

If your return does not include the missing payment then you must wait for your return to process and then file an amendment to include the missing payment.  Here is an IRS FAQ with more information. 

First be sure you did not get the stimulus payment added to you tax return.  It will show up on line 30 of your form 1040 as a Recovery Rebate Credit. 

As part of the interview in TurboTax you should have been asked about receiving the third stimulus payment and if so you would have been given the opportunity to enter the amount you received.  

Your return would have then adjusted to include any missing third stimulus payments based on the number of eligible people on your 2021 return.  

If, for example, you received 2800 for you and a spouse as a stimulus payment and now you have a daughter on your 2021 return,  line 30 would read 1400 as a Recovery Rebate credit.

@JCrawford2

If you have filed your 2021 Federal tax return, amongst your documents you will find the Recovery Rebate Credit Worksheet.  Line 14 should show a $1,400 Recovery Rebate Credit to reflect the newborn child.  It should also be reflected on line 30 of the Federal 1040 as Critter-3 states above.

If your return has been transmitted and rejected by the IRS, you can correct your tax return and re-transmit.

Make sure that the correct amount of the third stimulus payments is reported at the screen Let's double-check the amount you received.

If your return has been transmitted and accepted by the IRS, it may be corrected by the IRS but it could be delayed in processing.

Should you need to amend your Federal 1040 tax return, amended tax returns are expected to be available March 17.  See forms availability here.