| Synonym |
| Baby 28 weeks plus under 2.5 kg | Baby premature | Birth premature | Extreme immaturity | Extreme immaturity, 1,000-1,249 grams | Extreme immaturity, 1,250-1,499 grams | Extreme immaturity, 1,500-1,749 grams | Extreme immaturity, 1,750-1,999 grams | Extreme immaturity, 2,000-2,499 grams | Extreme immaturity, 2,500+ grams | Extreme immaturity, 500-749 grams | Extreme immaturity, 750-999 grams | Extreme immaturity, less than 500 grams | Extreme immaturity, unspecified {weight} | Immature baby | Infant premature | Other preterm infants | Other preterm infants, 1,000-1,249 grams | Other preterm infants, 1,250-1,499 grams | Other preterm infants, 1,500-1,749 grams | Other preterm infants, 1,750-1,999 grams | Other preterm infants, 2,000-2,499 grams | Other preterm infants, 2,500+ grams | Other preterm infants, 500-749 grams | Other preterm infants, 750-999 grams | Other preterm infants, less than 500 grams | Other preterm infants, unspecified {weight} | Premature baby | Premature birth | Prematurity | Prematurity syndrome | Syndrome prematurity | Premature baby 26 to 32 weeks | Premature baby 33 to 36 weeks | Premature baby less than 26 weeks | Late preterm infant | Very preterm infant | Extremely preterm (less than 28 weeks) | Moderate to late preterm (32 to 37 weeks) | Very preterm (28 to 32 weeks) | Premature Birth | Birth, Premature | Births, Premature | Premature Births | Preterm Birth | Birth, Preterm | Births, Preterm | Preterm Births |
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