noun
premature baby; preterm infant
Medical term for a baby born before 37 weeks of gestation. In everyday conversation, 未熟児 (みじゅくじ) is also used.
早生児は特別なケアが必要なことが多い。
Premature babies often need special care.
Compound of 早 (early) + 生 (birth) + 児 (child). The reading そうせいじ follows standard on'yomi.