能, but need to save child's W-2

We often get the question: "Does my child need to file a tax return to make a Roth IRA contribution?" The answer is "no". If their taxable income is below the threshold that would otherwise require them to file a tax return, they are not required to file a tax return just because a Roth IRA was funded in their name.

https://www.greenbushfinancial.com/all-blogs/can-i-open-a-roth-ira-for-my-child#:~:text=We%20often%20get%20the%20question,was%20funded%20in%20their%20name.?

Luckily, you can make a Roth IRA contribution without filing a tax return and do not need to file a tax return to make a Roth IRA contribution. (year 2020)

https://www.marottaonmoney.com/do-children-need-to-file-a-tax-return-to-fund-their-roth-ira-2020/#:~:text=Luckily%2C%20you%20can%20make%20a,make%20a%20Roth%20IRA%20contribution.?