WordNet records no synonym and no antonym for birth trauma. It is the only member of each of its synsets, which is common for technical, taxonomic and single-sense vocabulary — there is no other English word that means the same thing. The broader and narrower terms below are the useful relations in that case.
Counts are distinct word forms across every sense. A synonym that appears under three senses is counted once here and shown three times below, under each sense it belongs to.
physical injury to an infant during the birth process
emotional injury inflicted on an infant by events incident to birth that is alleged to appear in symbolic form in patients with mental illness
Synonyms, antonyms and the broader and narrower relations for birth trauma come from Princeton University’s WordNet. Full sources and licences.