Baby-of-the-family definition

The youngest member of an immediate family.
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A member of an immediate family who behaves as, or is treated as though they were the youngest member of a family.
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An adult member of an immediate family who is treated by others in the family, especially the parents, as though they were a child.
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Other Word Forms

Noun

Singular:
baby-of-the-family
Plural:
babies of the family