previous
unripe
prematurely
untimely
prematureness
prematurity
go off half-cocked
go off at half-cock
unripely
prematuration
oversoon
prenatal
wet behind the ears
antenatal
antepartum
premature
precocious
before someone's time
precociousness
ahead of time
twinkle in one's daddy's eye
preterm
earliness
greenly
youth
ungrown
premalignancy
rareripe
underdeveloped
incompetent
forestage
betides
hypomature
jejunely
early doors
immaturely
earlyish
periconceptional
precociality
preinitiation
congenital
conceive
jump the gun
innate
inborn
immatureness
premaximality
term
nonpremature
periconception