you can't get it through your a/c. you would need to establish an a/c for the child.
see this IRS website
https://www.irs.gov/identity-theft-fraud-scams/get-an-identity-protection-pin#alternatives
if you can do it online
you can fax the IRS form 15227
you use the child's name and SSN
but you provide your name as the person to call
https://www.irs.gov/pub/irs-pdf/f15227.pdf
