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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.
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]
Developmental Age, determined by calculating the results of the GDO-R, is an age in years and half-years that best describes a child's behavior and performance on a developmental scale. It may be equal to, older, or younger than the child's actual chronological age. It encompasses a child's social, emotional, intellectual and physical make up.
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.
Individual differences in motor ability are common and depend in part on the child's weight and build. Infants with smaller, slimmer, and more mature builds (proportionally) tend to belly crawl and crawl earlier than infants with larger builds. [97] Infants with more motor experience have been shown to belly crawl and crawl sooner.
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).
Bayley also examined the development of cognitive and motor functions in children, leading to her belief that intelligence evolves over the course of child development. [2] In 1954, Bayley began working on the National Collaborative Perinatal Project (NCPP) with the National Institute of Mental Health (NIMH), where she applied her work to ...
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 ...