From Middle English babe, a variant of earlier baban, perhaps from Old English *baba ("boy, child"), from Proto-Germanic *babô, reduplicated variant of *ba-, *bō-.
Related to Old Frisian bobba ("child"), Old High German Babo, see boy. Otherwise, origin obscure. Compare mama, dada, papa. Welsh baban ("baby"), believed by Skeat to be a mutation of maban, a diminutive of mab ("son"), is probably rather a borrowing from English. Cognate also with English bub#Etymology_3.
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