juvenile
individual organism that has not yet reached its adult form, sexual maturity, size
kitten
young cat
foal
young horse
squealer
seal that has lost his mother
juvenile fish
young fish
colt
male horse, usually below the age of four years
filly
young female horse
baby animal
juvenile animal
child
human between birth and puberty
yearling
young horse of either sex that is between one and two years old
kid
young goat
weanling
young animal just weaned from its mother