1.  yearling(n = noun.person) bambino, toddler, tot - a young child;
is a kind of child, fry, kid, minor, nestling, nipper, shaver, small fry, tiddler, tike, tyke, youngster

2.  yearling(n = noun.animal) - a racehorse considered one year old until the second Jan. 1 following its birth;
is a kind of bangtail, race horse, racehorse

3.  yearling(n = noun.animal) - an animal in its second year;
is a kind of eutherian, eutherian mammal, placental, placental mammal

   An animal one year old, or in the second year of its age; -- applied chiefly to cattle, sheep, and horses. [1913 Webster]

   Being a year old. Pope. [1913 Webster]

yearling, n. & adj.
--n.
1 an animal between one and two years old.
2 a racehorse in the calendar year after the year of foaling.
--adj.
1 a year old; having existed or been such for a year (a yearling heifer).
2 intended to terminate after one year (yearling bonds).

N  infant, babe, baby, babe in arms, nurseling, suckling, yearling, weanling, papoose, bambino, kid, vagitus, child, bairn, little one, brat, chit, pickaninny, urchin, bantling, bratling, elf, youth, boy, lad, stripling, youngster, youngun, younker, callant, whipster, whippersnapper, whiffet, schoolboy, hobbledehoy, hopeful, cadet, minor, master, scion, sap, seedling, tendril, olive branch, nestling, chicken, larva, chrysalis, tadpole, whelp, cub, pullet, fry, callow, codlin, codling, foetus, calf, colt, pup, foal, kitten, lamb, lambkin, aurelia, caterpillar, cocoon, nymph, nympha, orphan, pupa, staddle, girl, lass, lassie, wench, miss, damsel, demoiselle, maid, maiden, virgin, hoyden, infantine, infantile, puerile, boyish, girlish, childish, babyish, kittenish, baby, newborn, unfledged, new-fledged, callow, in the cradle, in swaddling clothes, in long clothes, in arms, in leading strings, at the breast, in one's teens.