cabbage patch
/ˈkabɪdʒ patʃ/noun
1A distinct area of land used for growing cabbages.
2 Figurative and in extended use. Frequently (chiefly North American ): (traditionally, as in explanation to children) the place where newborn babies are found.
Origin
Early 19th century; earliest use found in Charles Vancouver (bap. 1756, d.?1815), agricultural improver and writer. From cabbage + patch.