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The second stage, with up to three items, begins after eight months. [17] [19] The third stage appears at about 3.5 years of age with four items. [17] [20] The fourth stage starts in children when they are about five years old and can hold five or more items in the focal point. [17] [19]
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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]
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
After 6 months of age, babies can continue nursing while other sources of nutrition are introduced, including iron-rich foods like pureed meats and certain oats, barley and rice cereals.
By about 8–12 months, they go through a fairly rapid change and become fearful of perceived threats. [113] By around 6–36 months, infants begin to prefer familiar people and show anxiety and distress when separated from them, and when approached by strangers. [114] Separation anxiety is a typical stage of development to an extent.
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Among six-month-old infants, seen articulations (i.e. the mouth movements they observe others make while talking) actually enhance their ability to discriminate sounds, and may also contribute to infants' ability to learn phonemic boundaries. [9] Infants' phonological register is completed between the ages of 18 months and 7 years. [4]