Use form 8814 to report the child's income on your return. It's easy to fill in this form, and you'll report the income but there is an exemption of $900, so there will be no tax.
The child can also file their own return, but they have to also attach a form in the 8000's to say they are a dependent but are filing their own tax return, and some of their income will be taxed at higher rates, though the tax would be zero in this case. So in your case, the above method is just fine. Simpler.
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