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The infant is undergoing many adaptations to extrauterine life, and its physiological systems, such as the immune system, are far from fully developed. Potential diseases of concern during the neonatal period include: Neonatal jaundice; Infant respiratory distress syndrome; Neonatal lupus erythematosus; Neonatal conjunctivitis; Neonatal tetanus
There is a debate among scientists regarding the extent to which newborn infants are capable of forming memories, the effects of any such memories on their personality, and the possibility of recovering them from an unconscious mind, which itself is the subject of argument in the field. A widespread assumption concerning the prenatal phase was ...
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.
These periods are divided into three stages. The first stage occurs in the first 30 minutes of life; during this stage the infant is alert and responsive with heart rate peaking at 160-180 beats per minute and then stabilizes to a baseline rate of 100-120 beats per minute. Crackles upon auscultation and irregular respirations are a normal finding.
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.
Adequate nutrition is needed for a healthy fetus. Mothers who gain less than 20 pounds during pregnancy are at increased risk for having a preterm or low birth weight infant. [51] Iron and iodine are especially important during prenatal development. Mothers who are deficient in iron are at risk for having a preterm or low birth weight infant. [52]
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]
Gestational age: 3 weeks and 0 days until 3 weeks and 6 days old. 22–28 days from last menstruation. Embryonic age: Week nr 2. 1 week old. 8–14 days from fertilization.