You can contact the Social Security Administration at www.ssa.gov.
Social Security numbers are confidential information, so they are not available online. You will have to call.
@xmasbaby0 Had a very complete answer on using TurboTax to get the information.
No one can look it up for you. If you have listed your child as a dependent on a past tax return then you can look at one of those returns and get the SSN from it.
You have to access your own account and/or print it for yourself using exactly the same account and user ID that you used when you prepared the return.
https://ttlc.intuit.com/community/prior-year-return/help/how-do-i-access-my-prior-year-return/01/270...
Many people have multiple TT accounts and forget how to access them. Log out of the account you are in now.
Account recovery
https://myturbotax.intuit.com/account-recovery/
https://ttlc.intuit.com/questions/1901535-forgot-your-turbotax-online-user-id-or-password
Or did you use the desktop version of TurboTax? If so, the files are on your own hard drive or any backup device you used like a flash drive.
https://ttlc.intuit.com/questions/1901486-how-many-turbotax-accounts-do-i-have
https://ttlc.intuit.com/questions/1901535
https://ttlc.intuit.com/questions/1901659-find-your-tax-data-file-in-mac
https://ttlc.intuit.com/questions/1900721-find-your-tax-data-file-tax-file-in-windows
Or......
To Replace a Child’s Social Security card
https://faq.ssa.gov/en-US/Topic/article/KA-02723
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