Preterm infant is a term used to describe a baby born before 37 weeks of gestation. However, there are several synonyms used to describe this type of baby. These include premature baby, preemie, preterm newborn, premature infant, early arrival, and premature neonate. Each synonym describes a baby that is born before their full term and requires special care and attention. These terms are used interchangeably in the medical field and by parents, who may use different descriptions depending on their individual preferences. Regardless of the term used, preterm infants require specialized care and support to ensure they grow and develop healthily.