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She has just born a baby boy.

Is this a correct sentence?

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No.

[informal] She's just had a baby boy.

[formal] She has just given birth to a baby boy.

[very formal and old-fashioned] She has just borne a baby boy.

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No, we don't use 'born' like that.

We commonly say She has just had a baby.

A little more formally, we say She has just given birth.