위에 ㅇㅇ 님께서 정확하게 답은 주셨는데
그에 따른 IRS 백업 조항을 첨부드립니다
https://www.irs.gov/faqs/filing-requirements-status-dependents/dependents/dependents-9
Please note that you may not claim your child as a qualifying child for the EIC on either your original or an amended return if your child doesn’t have an SSN on or before the due date of your return (including extensions), even if your child later gets an SSN. Similarly, you may not claim your child as a qualifying child for the CTC/ACTC if your child doesn’t have an SSN on or before the due date of your return (including extensions), even if your child later gets an SSN
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