baby (n.)

late 14c., babi, "infant of either sex," diminutive of babe (see babe) with -y (3). Meaning "childish adult person" is from c. 1600. Meaning "youngest of a group" is by 1897. As a term of endearment for one's lover it is attested perhaps as early as 1839, certainly by 1901 (OED writes, "the degree of slanginess in the nineteenth-century examples is not easily determinable"); its popularity perhaps boosted by baby vamp "a popular girl" (see vamp (n.2)), student slang from c. 1922.

Meaning "minute reflection of oneself seen in another's eyes" is from 1590s (compare pupil (n.2)). As an adjective by 1750. Baby food is from 1833. Baby blues for "blue eyes" recorded by 1892 (the phrase also was used for "postpartum depression" 1950s-60s). To empty the baby out with the bath (water) is attested by 1909 (in G.B. Shaw; compare German das Kind mit dem Bade ausschütten, attested from 17c.). A baby's breath was noted for sweet smell, which also was supposed to attract cats, hence baby's breath as the name of a type of flower, attested from 1897. French bébé (19c.) is said to be from English, but there were similar words in the same sense in French dialects.

baby (v.)

"to treat like a baby," 1742, from baby (n.). Related: Babied; babying.

updated on January 18, 2021

Definitions of baby from WordNet
baby (n.)
a very young child (birth to 1 year) who has not yet begun to walk or talk;
she held the baby in her arms
the baby began to cry again
it sounds simple, but when you have your own baby it is all so different
Synonyms: babe / infant
baby (n.)
the youngest member of a group (not necessarily young);
the baby of the family
the baby of the Supreme Court
baby (n.)
an immature childish person;
stop being a baby!
Synonyms: child
baby (n.)
an unborn child; a human fetus;
it was great to feel my baby moving about inside
I felt healthy and very feminine carrying the baby
baby (n.)
a very young mammal;
baby rabbits
baby (n.)
a project of personal concern to someone;
this project is his baby
baby (v.)
treat with excessive indulgence;
Synonyms: pamper / featherbed / cosset / cocker / coddle / mollycoddle / spoil / indulge
Etymologies are not definitions. From, not affiliated with etymonline.