Actually SSI numbers were not issued at birth in those days. You actually had to apply for an SSI number. Most people then didn’t apply until they wanted to get their first job. Up until that time any income they had from a bank account, etc. could just be listed on their parent’s income tax return so they didn’t need one until they wanted to go to work. Your SSI number was issued from the state where you applied for it, which may or may not have been the state where you were born.
Actually SSI numbers were not issued at birth in those days.
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Got my card when I was 6. Parents had had it for some time before that - that’s just when they showed it to me. Long before obizmo’s mom was born.