Newborn
Part of speech: adjective
Definition: recently born. born anew, reborn.
Part of speech: noun
Definition: A recently born baby.
Example sentence: And also I assert our interest in respecting all our obligations and implementing all our commitments. And will save no effort whatever to protect this newborn opportunity of peace, that is provided through what we have already declared here today.
Immature
Part of speech: adjective
Definition: Not fully formed or developed, unripe.Childish in behavior.
Example sentence: Basically my wife was immature. I'd be at home in the bath and she'd come in and sink my boats.