You should not get penalized for that. Amending before they have processed your original return can just cause confusion and delays. Wait for the IRS to process the return, and yes, you will have to pay back the $1400 with your amended return.
One other thing---was the "adult child" a full-time student in 2021? If so the $4300 income does not come into play. If he was under 24 and and was a student you can still claim him even if he made over $4300.
**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.**
