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Physical development. Typically grows between 1 and 1.5 inches (2.5 and 3.8 cm) and gains about 2 pounds (910 g). [20] Motor development. Hands kept in tight fists. [21] Equal movement of arms and legs on both sides. [21] Able to briefly hold up head when in prone position. [21] Arm thrusts are jerky. [22] Brings hands close to eyes and mouth. [22]
Developmental Age, determined by calculating the results of the GDO-R, is an age in years and half-years that best describes a child's behavior and performance on a developmental scale. It may be equal to, older, or younger than the child's actual chronological age. It encompasses a child's social, emotional, intellectual and physical make up.
Life span development can be defined as age-relating experiences that occur from birth to the entirety of a human's life. The theory considers the lifelong accumulation of developmental additions and subtractions, with the relative proportion of gains to losses diminishing over an individual's lifetime. [14]
Human embryology is the study of this development during the first eight weeks after fertilization. The normal period of gestation (pregnancy) is about nine months or 40 weeks. The germinal stage refers to the time from fertilization through the development of the early embryo until implantation is completed in the uterus.
Erikson's stages of psychosocial development, as articulated in the second half of the 20th century by Erik Erikson in collaboration with Joan Erikson, [1] is a comprehensive psychoanalytic theory that identifies a series of eight stages that a healthy developing individual should pass through from infancy to late adulthood.
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.
Development before birth, or prenatal development (from Latin natalis 'relating to birth') is the process in which a zygote, and later an embryo, and then a fetus develops during gestation. Prenatal development starts with fertilization and the formation of the zygote , the first stage in embryonic development which continues in fetal ...
The Bayley Scales of Infant and Toddler Development (version 4 was released September 2019) is a standard series of measurements originally developed by psychologist Nancy Bayley used primarily to assess the development of infants and toddlers, ages 1–42 months. [1]