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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]
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, taste, smell and language, all of which require processing by our cognitive system. [2]
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.
Most children don't say their first word until the age of 1 but Helena Kordaé's son might be an exception.
Early childhood development is the period of rapid physical, psychological and social growth and change that begins before birth and extends into early childhood. [1] While early childhood is not well defined, one source asserts that the early years begin in utero and last until 3 years of age.
The Interpersonal World of the Infant (1985) is one of the most prominent works of psychoanalyst Daniel N. Stern, in which he describes the development of four interrelated senses of self. [1] These senses of self develop over the lifespan, but make significant developmental strides during sensitive periods in the first two years of life.