IRS Publication 972 (2019), Child Tax Credit and Credit for Other Dependents page 2 - https://www.irs.gov/pub/irs-pdf/p972.pdf#page=2
Each qualifying child you use for the CTC or ACTC must have the required SSN.
If you have a qualifying child who does not have the required SSN, you cannot use the child to claim the CTC or ACTC on either your original or an amended 2019 return. The required SSN is one that is valid for employment and is issued before the due date of your 2019 return (including extensions).
If your qualifying child does not have the required SSN, but has another type of taxpayer identification number issued on or before the due date of your 2019 return (including extensions), you may be able to claim the ODC for that child.
