This change occurs during the first stage of parturition, and the orientation changes where 60–70 percent of the puppies are born headfirst. Changes in orientation leave about 30–40 percent are ^([sic]) born tailfirst.
Source: wiktionary
Tailfirst
Synonyms for "tailfirst"
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Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.