A person who has not yet reached adulthood, whether natural (puberty), cultural (initiation), or legal (majority)
Go easy on him: he is but a child.
(specifically) A female child, a girl.
(with possessive) One's direct descendant by birth, regardless of age; a son or daughter.
My youngest child is forty-three this year.
The thirteenth Lenormand card.
A figurative offspring, particularly:
A child of noble birth.
The cognomen given to the oldest son prior to his taking his father's title.