IPA: /prɪˈmʌtʃərɪti/
KK: /priˈmjuːtʃərɪti/
The state of being born before the normal time, especially referring to babies who are born too early.
The doctors monitored the baby closely due to his prematurity.
Prematurity → It is formed from "pre-" (meaning before) and "maturus" (meaning ripe or mature) and the suffix "-ity" (meaning the state or quality of). The word "prematurity" refers to the state of being born before the expected time, or not fully developed, hence before maturity.
Think of something that happens 'before' ('pre-') it is 'ripe' or 'mature' — that's why prematurity refers to being born too early.