We found one dictionary that defines the word sow's baby:

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1. sow's baby: Wiktionary

Definitions from Wiktionary (sow's baby) ▸ noun:  (UK, obsolete, slang) A sixpence coin. ▸ Words similar to sow's baby ▸ Usage examples for sow's baby ▸ Idioms related to sow's baby ▸ Wikipedia articles (New!) ▸ Words that often appear near sow's baby ▸ Rhymes of sow's baby ▸ Invented words related to sow's baby