| preterm birth |
live birth at a gestation of less than 37 weeks, or up to and including 36 weeks and 6 days, starting from the date of the onset of the LMP |
| term birth |
live birth at a gestation of between 37 and 42 weeks |
| moderately preterm birth |
live birth at gestation of 32 to less than 37 weeks |
| very preterm birth |
live birth at gestation of 28 to less than 32 weeks |
| extremely preterm birth |
live birth at gestation < 28 weeks |
| low birthweight |
birthweight < 2500 g |
| very low birthweight |
birthweight < 1500 g |
| extremely low birthweight |
birthweight < 1000 g |
| small for gestational age |
birthweight below the 10th percentile of the recommended sex-specific birthweight for gestational age reference curves, often caused by fetal growth restriction |
| fetal growth restriction |
a common pregnancy condition in which the fetus does not reach their biological growth potential, most often because of placental dysfunction; also referred to as intra-uterine growth retardation |
