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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 at a similar rate to the previous month, usually growing between 1 and 1.5 inches (2.5 and 3.8 cm) and gaining about 2 pounds (910 g). [23] Resting heart rate is usually between 80 and 160 beats per minute, and it typically stays within that range until the infant is about one year old. [18] Motor development
The Denver Developmental Screening Test was developed in Denver, Colorado, by Frankenburg and Dodds and published in 1967. [3] As the first tool used for developmental screening in normal situations like pediatric well-child care, the test became widely known and was used in 54 countries and standardized in 15.
Robert Lowell Fantz [1] (1925–1981) [2] was an American developmental psychologist who pioneered several studies into infant perception. In particular, the preferential looking paradigm introduced by Fantz in the 1961 is widely used in cognitive development and categorization studies among small babies.
It was validated both at the hospital and the community level against the standard Denver Developmental Screening Test. [2]With a sensitivity of 66.7% and specificity of 78.8%, it can be used even by community level health worker for mass screening and takes around 5 minutes to complete. [2]
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The most current form of the schedules comes from the Gesell Institute of Child Development and is known as the Gesell Developmental Observation-Revised for ages 2 ½ to 9 years. [2] This assessment uses the principles of the schedules to determine the developmental age & stage of an any given child.
The Child Behavior Checklist (CBCL) is a widely used caregiver report form identifying problem behavior in children. [ 1 ] [ 2 ] It is widely used in both research and clinical practice with youths. It has been translated into more than 90 languages, [ 3 ] and normative data are available integrating information from multiple societies.