1. (noun) a baby from birth to four weeks

• neonate
• newborn
• newborn baby

1. (noun) a baby from birth to four weeks

• babe
• baby
• infant

1. (noun) a baby from birth to four weeks

• liveborn infant
• low-birth-weight baby
• low-birth-weight infant
• postmature infant
• preemie
• premature baby
• premature infant
• premie
• preterm baby
• preterm infant
• sga infant
• small-for-gestational-age infant
• stillborn infant
• term infant