It depends.
If you used TurboTax last year, you can log into your account a print out a copy of your prior tax returns to obtain their numbers. Please see the link below for more information on how to do this.
Accessing prior year returns in TurboTax
You can also request a transcript from the IRS using the link below.
Requesting copies of prior returns from the IRS
If you are unable to use the methods above, you will need to contact the Social Security Administration to obtain a copy of your child's social security number.
Social Security Administration
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