1 adolescent, callow, green, growing, immature, infant, in the springtime of life, junior, juvenile, little, unfledged, youthful
2 at an early stage, early, fledgling, new, newish, not far advanced, recent, undeveloped
n
3 babies, brood, family, issue, litter, little ones, offspring, progeny
Antonyms
, adj adult, advanced, aged, developed, elderly, experienced, full-grown, grown-up, mature, old, ripe, senior, venerable
n adult, grown-up, parent