Similar word to unweaned:

adolescent, babyish, beardless, blooming, boyish, budding, callow, childlike, developing, formative, fresh, girlish, green, growing, immature, inexperienced, infant, infantile, jejune, junior, kid stuff, milk-fed, naive, pubescent, puerile, teenage, tender, undeveloped, unfledged, unripe, unsophisticated, unweaned, vernal, young, younger, youthful