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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]
Infants are usually born weighing between 5 pounds 8 ounces (2,500 g) and 8 pounds 13 ounces (4,000 g), but infants born prematurely often weigh less. [ 17 ] Newborns typically lose 7–10% of their birth weight in the first few days, but they usually regain it within two weeks.
"When the infant first rolls from back to stomach unassisted" [1] "When the child first utters words" [1] "When the child learns to walk" [1] The Gesell Developmental Schedule was then able to compare the infant or child's rate of development to a norm that was derived from a previous longitudinal study (see history, above).
Sensory Motor: (birth to about age 2) In the first stage in Piaget's theory, infants have the following basic senses: vision, hearing, and motor skills. In this stage, knowledge of the world is limited but is constantly developing due to the child's experiences and interactions. [11]
In motor behaviors, this can be seen in an infant’s tonic neck reflex, where babies prefer to lie with their heads turned to one side and extend their arm to the same side which the head is turned while flexing the other arm behind their head. It is a reflex where the infant directs vision towards the hand or fist in extension.
Fine motor: the ability to control small muscles; enabling the toddler to feed themselves, draw and manipulate objects. Vision : the ability to see near and far and interpret what is seen. Hearing and speech : the ability to hear and receive information and listen ( interpret ), and the ability to understand and learn language and use it to ...
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Fine motor skills are the coordination of small muscle movements which occur e.g., in the fingers, usually in coordination with the eyes. In application to motor skills of hands (and fingers) the term dexterity is commonly used. The term 'dexterity' is defined by Latash and Turrey (1996) as a 'harmony in movements' (p. 20).