child development

child development, 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.

A brief treatment of child development follows. For full treatment, see human behavior: Theories of development. The physical growth of children is treated in human development.

Early childhood

The end of infancy and the onset of childhood are marked by the emergence of speech, typically occurring between one and two years of age. During their second year, children make enormous progress in language acquisition, demonstrating a steadily growing vocabulary, increasing use of word combinations, and an emerging understanding of the rules of grammar and syntax. By their third year children commonly produce sentences of five or more words, and by the fourth year, they are capable of engaging in conversation using adultlike sentence structures. By ages five and six, most children demonstrate a strong command of complex rules of grammatical forms and meaning.

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Characteristics of the Human Body

Early childhood (approximately two to seven years) is also the time in which children develop the capacity for symbolic thought, using language and mental representations to interpret and interact with their environment. This period corresponds to what developmental psychologist Jean Piaget described as the preoperational stage, characterized by the emergence of symbols, concepts, and mental imagery. During this time, children increasingly use these representations to process and transform information about the world, allowing them to engage in imaginative play, represent objects that are not physically present, and begin organizing their experiences in more structured ways.

Logic and memory

The beginnings of logic, involving the classification of ideas and an understanding of time and number, emerge in later childhood (7 to 12 years). Piaget associated this later period with the concrete operational stage, marked by increasing logical reasoning about concrete events. During this stage, children begin to grasp the concept of conservation—the understanding that quantity remains the same despite changes in shape or appearance—which reflects a major advance in logical thinking. They also develop the ability to organize objects into hierarchical categories, recognizing relationships such as subsets within larger groups.

Memory processes also become more strategic and efficient during this period. Children increasingly use techniques such as rehearsal, organization, and grouping to store and retrieve information, rather than relying solely on passive recall. Working memory capacity expands, allowing children to hold and process more information at once, which supports problem-solving and reasoning tasks.

In addition, children become less egocentric in their thinking, improving their ability to consider multiple perspectives and understand cause-and-effect relationships. These cognitive advances are closely tied to both brain development and increased experience in structured environments such as school, where tasks often require planning, sequencing, and logical analysis.

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Physical and emotional changes

Young children’s growing awareness of their own emotional states, characteristics, and abilities contributes to the development of empathy, the ability to appreciate the feelings and perspectives of others. This emerging social awareness plays a critical role in the formation of moral understanding, which in early childhood typically progresses from a focus on avoiding punishment to a desire to gain approval from caregivers.

Another important aspect of children’s emotional development is the formation of their self-concept, or identity, encompassing a child’s understanding of who they are and how they relate to others. Gender identity, often one of the earliest and most salient aspects of self-awareness, generally becomes established by about three years of age..

The end of childhood and the onset of adolescence are marked by the emergence of the physical and emotional changes associated with puberty, along with the development of more advanced, adultlike patterns of logical reasoning.