新しん生せい児じ死し亡ぼうMeanings1nounneonatal deathmedicineMedical term for the death of a newborn within the first 28 days of life.新しん生せい児じ死し亡ぼうの主おもな原げん因いんは早そう産ざんと先せん天てん性せい異い常じょうです。The main causes of neonatal death are preterm birth and congenital anomalies.