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A newborn is, in colloquial use, a baby who is only hours, days, or weeks old; while in medical contexts, a newborn or neonate (from Latin, neonatus, newborn) is an infant in the first 28 days after birth [2] (the term applies to premature, full term, and postmature infants).
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 ]
Infants are usually born weighing between 5 pounds 8 ounces (2,500 g) and 8 pounds 13 ounces (4,000 g), but infants born prematurely often weigh less. [ 17 ] Newborns typically lose 7–10% of their birth weight in the first few days, but they usually regain it within two weeks.
Individual differences in motor ability are common and depend in part on the child's weight and build. Infants with smaller, slimmer, and more mature builds (proportionally) tend to belly crawl and crawl earlier than infants with larger builds. [97] Infants with more motor experience have been shown to belly crawl and crawl sooner.
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.
Infant perception is what a newborn can see, hear, smell, taste, and touch. These five features are considered as the "five senses". [94] Because of these different senses, infants respond to stimuli differently. [85] Vision is significantly worse in infants than in older children. Infant sight tends to be blurry in early stages but improves ...
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]
A babbling infant, age 6 months, making ba and ma sounds. Babbling is a stage in child development and a state in language acquisition during which an infant appears to be experimenting with uttering articulate sounds, but does not yet produce any recognizable words.