@Andrew2016
If you did put the child's income on your return then you can amend your return to fix the error. And also file the child's return for their proper refund. At no time did the program tell you to put their W-2 income on your return ... in fact in the W-2 input section there is only the indicator for the taxpayer or spouse ... it you could also put the child's income there then there would be an option for it in the interview.
