I usually just hear the adjective or noun 'first-born'. eg I am the first-born child in my family. eg I am the first-born in my family.
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I usually just hear the adjective or noun 'first-born'.
eg I am the first-born child in my family.
eg I am the first-born in my family.
So, I'd say second-born.
We don't use the word 'borne' in this way.