
Preterm birth (partus praetemporaneus or partus praematurus) is the birth of a baby of less than 37 weeks gestational age; such a baby is sometimes referred to as a `preemie` or `premmie`, depending on local pronunciation. The cause of preterm birth is in many situations elusive and unknown; many factors appear to be associated with the develo...
Found on
http://en.wikipedia.org/wiki/Preterm_birth

A birth that takes place after at least 20, but less than 37, completed weeks of gestation. This includes both live births and stillbirths.
Found on
http://www.encyclo.co.uk/local/21429

When the act of being born occurs before the 38th week of pregnancy.
Found on
https://www.momresource.ca/preconception/glossary-of-baby-related-terms/
No exact match found.