preterm infant

例句：

1. 1. The preterm infant's health is closely monitored by doctors.
   早产儿的健康由医生密切监控。
2. 2.The preterm infant was born at 34 weeks and weighed only 5 pounds.
   这个早产儿出生时只有34周大，体重只有5磅。
3. 3.Preterm infants often have developmental delays, so they need special care.
   早产儿通常有发育延迟，所以需要特别的照顾。