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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]
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. [28] Fat rolls ("Baby Fat") begin to appear on thighs, upper arms and neck. Motor development. May be able to roll from front to back. [29] Starts to reach and grasp for ...
Newborn infants do not seem to experience fear or have preferences for contact with any specific people. In the first few months they only experience happiness, sadness, and anger. [ 110 ] [ 111 ] A baby's first smile usually occurs between 6 and 10 weeks, as this usually occurs during social interactions it is called a "social smile". [ 112 ]
The CDC divides these milestones into several categories for each age, including social and emotional behaviors, language and communication skills, cognitive abilities and physical development and ...
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. [12]
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]
Accordingly, the scale would purportedly be able to show that infants and young children who demonstrate behaviors or responses more typical of an older chronological age would have higher intelligence. [1] Additionally, the Gesell Developmental Schedule has moved beyond merely identifying high-intelligence children and has become a research tool.
However, when infants were placed in water, that same stepping reflex returned. [36] [37] This offered a model for the continuity of the stepping reflex and the progressive stimulation model for behavior analysts. Infants deprived of physical stimulation or the opportunity to respond were found to have delayed motor development.