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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] This measure consists of a series of developmental play tasks and takes ...
Baby sign language. A child signing the concept of "bird". Baby sign language is the use of manual signing allowing infants and toddlers to communicate emotions, desires, and objects prior to spoken language development. [1] [2] With guidance and encouragement, signing develops from a natural stage in infant development known as gesture. [3]
The vision of infants under one month of age ranges from 6/240 to 6/60 (20/800 to 20/200). By two months, visual acuity improves to 6/45 (20/150). By four months, acuity improves by a factor of 2 – calculated to be 6/18 (20/60) vision. As the infant grows, the acuity reaches the healthy adult standard of 6/6 (20/20) at six months.
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Infant cognitive development is the first stage of human cognitive development, in the youngest children. The academic field of infant cognitive development studies of how psychological processes involved in thinking and knowing develop in young children. [1] Information is acquired in a number of ways including through sight, sound, touch ...
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By this age, infants may have doubled their birth weights. They typically grow about 0.8 inches (2.0 cm) and gain about 1 to 1.5 pounds (450 to 680 g) during this month. Fat rolls ("Baby Fat") begin to appear on thighs, upper arms and neck. Motor development. May be able to roll from front to back. Starts to reach and grasp for objects.