infant

American  

[in-fuhnt] / ˈɪn fənt /

noun

1. a child during the earliest period of their life, especially before they can walk; baby.

2. Law. a person who is not of full age, especially one who has not reached the age of 18 years; a minor.

3. a beginner, as in experience or learning; novice.

   The new candidate is a political infant.

4. anything in the first stage of existence or progress.

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adjective

1. of or relating to infants or infancy.

   infant years.

2. being in infancy.

   an infant king.

3. being in the earliest stage.

   an infant industry.

4. of or relating to the legal state of infancy; minor.

infant British  

/ ˈɪnfənt /

noun

1. a child at the earliest stage of its life; baby

2. law another word for minor

3. a young schoolchild, usually under the age of seven

4. a person who is beginning or inexperienced in an activity

5. (modifier)

   1. of or relating to young children or infancy

   2. designed or intended for young children

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adjective

1. in an early stage of development; nascent

   an infant science or industry

2. law of or relating to the legal status of infancy

Other Word Forms

• infanthood noun
• infantlike adjective

Etymology

Origin of infant

First recorded in 1350–1400; from Latin infant- (stem of infāns ) “small child,” literally, “one unable to speak,” equivalent to in- in- ³ + -fāns, present participle of fārī “to speak”; replacing Middle English enfaunt, from Anglo-French, from Latin, as above

Explanation

An infant is a baby. When you were an infant, you weren't able to walk, talk, or feed yourself (but you had a pretty mean burp). Infant is most often used for a very young human, but you can also use it to talk about animal babies. People are considered infants from the moment of birth until approximately one year old, an age when many babies are starting to walk and talk. At this point, they're commonly called toddlers instead of infants. The Latin root is infantem, which as a noun means "babe in arms," and as an adjective "unable to speak."

Example Sentences

The company conducted three late-stage trials: two with infant patients showed positive results, and a third that studied the medicine in adults and adolescents didn’t deliver a statistically significant outcome for its primary objective.

From The Wall Street Journal • Mar. 31, 2026

Once firefighters arrived and extracted the infant, they began performing CPR, but it looked like the baby was turning blue, she said.

From Los Angeles Times • Mar. 31, 2026

Despite a 17% drop in 2025 births, policies create investment niches in fertility, infant products, and family infrastructure, viewed as a consumption policy.

From Barron's • Mar. 30, 2026

The full infant kit with name and number is £64.99.

From BBC • Mar. 25, 2026

Like any infant, it must be cared for if it is to survive.

From "Jeremy Thatcher, Dragon Hatcher" by Bruce Coville

Related Words

• child
• kid
• newborn
• toddler