I incorrectly checked the wrong box on line 4

[jpharned69-]

For my child credt

[VolvoGirl]

Did you file it yet?  You can amend.

If you haven't filed yet go to My Info and check all the info for that child.  How old?  Was he born in 2020?  A child born (even on Dec 31) is considered to live with you the whole year.  So be sure to pick the Whole Year at the top of the drop down box.

[rjs]

Line 4 where? On what form? Where exactly did you check the wrong box?