Your child may need to file their own tax return to report the Form 1099-NEC income. It will be reported on Schedule C because they were paid as an independent contractor instead of an employee.
Since this was earned income, it cannot be reported on your return on behalf of your child.
See the following TurboTax help article to learn more about the income thresholds that define when a dependent is required to file:
Do I need to file my own taxes if I'm a dependent?