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The Bayley Scales of Infant and Toddler Development (version 4 was released September 2019) is a standard series of measurements originally developed by psychologist Nancy Bayley used primarily to assess the development of infants and toddlers, ages 1–42 months. [1]
Between 2 and 3 years of age, the child is able to refer to themself as "me", combine nouns and verbs, use short sentences, use some simple plurals, answer "where" questions, and has a vocabulary of about 450 words. [131] By age 4, children are able to use sentences of 4–5 words and have a vocabulary of about 1000 words. [131]
The results were published in School Readiness: Behavior Tests used at the Gesell Institute. In 2011, the instrument was revised and data was collected only on ages 3–6 years. Today, it is one of the oldest and most established intelligence measures of young children.
Some children can tell time on the hour: five o'clock, two o'clock. Knows what a calendar is for. Recognizes and identifies coins; beginning to count and save money. Many children know the alphabet and names of upper- and lowercase letters. Understands the concept of half; can say how many pieces an object has when it has been cut in half.
Behavior analysis in child development takes a mechanistic, contextual, and pragmatic approach. [6] [7] From its inception, the behavioral model has focused on prediction and control of the developmental process. [8] [9] The model focuses on the analysis of a behavior and then synthesizes the action to support the original behavior. [10]
Early childhood development is the period of rapid physical, psychological and social growth and change that begins before birth and extends into early childhood. [1] While early childhood is not well defined, one source asserts that the early years begin in utero and last until 3 years of age.
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In addition, the Processing Speed Quotient (known as the Processing Speed Index on previous Wechsler scales) can be derived for children aged 4 – 7 years 3 months, and a General Language Composite can be determined for children in both age bands (2 years 6 months – 3 years 11 months & 4–7 years 3 months). Children in the 2 years 6 months ...
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