preterm
adjective /ˌpriːˈtɜːm/
  /ˌpriːˈtɜːrm/
- born or happening after a short pregnancy, especially one that is less than 37 weeks
- caring for low birthweight and preterm babies
 - a preterm birth/delivery
 
Oxford Collocations DictionaryPreterm is used with these nouns:- baby
 - birth
 - delivery
 - …