The typical title for a baby girl is generally not required, but if one were to be used, it would be Miss.
Explanation
While babies typically don't use titles like "Miss" or "Ms." in everyday conversation or formal documentation, if a title were necessary (perhaps for a theatrical production or a humorous context), "Miss" would be the appropriate choice.
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Miss: This title is traditionally used for unmarried women and girls. Since a baby girl is unmarried, "Miss" would be the grammatically correct and conventionally accepted title, if one were needed.
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Ms.: This title is generally reserved for adult women, regardless of marital status, and is not suitable for a baby.
Therefore, in the rare circumstance where a title is required for a baby girl, "Miss" is the most appropriate option.
