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Child - Wikipedia
The United Nations Convention on the Rights of the Child defines child as, "A human being below the age of 18 years unless under the law applicable to the child, majority is attained earlier." [11]

CHILD Definition & Meaning - Merriam-Webster
In contemporary English, kid is neither slang nor improper. It is, however, most definitely informal, so those writing professionally or in a formal register might prefer to use child.

child - Wiktionary, the free dictionary
Go easy on him: he is but a child. Regular chores can be appropriate for children, given age-appropriate limits on difficulty level and time on task.

CHILD | English meaning - Cambridge Dictionary
CHILD definition: 1. a boy or girl from the time of birth until he or she is an adult, or a son or daughter of any…. Learn more.

CHILD Definition & Meaning | Dictionary.com
A child is a young person who's typically older than a baby but younger than a teen. As a child, you probably had your parents watching over you as you played in a sandbox.

CDC's Developmental Milestones | Learn the Signs. Act Early. | CDC
Skills such as taking a first step, smiling for the first time, and waving “bye bye” are called developmental milestones. Children reach milestones in how they play, learn, speak, act, and move. Learn about the developmental milestones that most babies do by two months of age.

Child - definition of child by The Free Dictionary
1. a person between birth and full growth; a young boy or girl. 2. a son or daughter. 3. a baby or infant.

Child-Pugh Score for Cirrhosis Mortality - MDCalc
The Child-Pugh Score for Cirrhosis Mortality estimates cirrhosis severity.

Child development | Definition, Stages, & Facts | Britannica
Child development is the progressive maturation of perceptual, emotional, intellectual, and behavioral functions from the early stages of language acquisition, typically around one or two years of age, to the onset of adolescence, at about 12 or 13 years.

Child | definition of child by Medical dictionary
They typically lack parenting skills and do not understand the normal developmental stages through which children progress and demand performance from their children that is clearly beyond a child's capability.