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The vision of infants under one month of age ranges from 6/240 to 6/60 (20/800 to 20/200). [4] 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. [5]
Physical development. Typically grows between 0.5 and 0.75 inches (1.3 and 1.9 cm) and gains between 1 and 1.25 pounds (450 and 570 g) Motor development. Able to push up to a crawling position and may be able to rock on knees. [31] Able to sit with support. [31] Able to stand with help and bounce while standing. [31]
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]
Some age-related development periods with defined intervals include: newborn (ages 0 – 2 months); infant (ages 3 – 11 months); toddler (ages 1 – 2 years); preschooler (ages 3 – 4 years); school-aged child (ages 5 – 12 years); teens (ages 13 – 19 years); adolescence (ages 10 - 25 years); college age (ages 18 - 25 years).
The DQ is determined according to the scores of the test and is evaluated by ascertaining whether or not the infant or child is displaying the appropriate behavior for the age (The individual's developmental quotient is a parallel to the mental age (MA) concept). [1] In turn, The DA(development age) is used as part of an IQ formula:
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Eye development is initiated by the master control gene PAX6, a homeobox gene with known homologues in humans (aniridia), mice (small eye), and Drosophila (eyeless). The PAX6 gene locus is a transcription factor for the various genes and growth factors involved in eye formation. [1] [5] Eye morphogenesis begins with the evagination, or ...
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