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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. [1]
Genetic factors play a major role in determining the growth rate, particularly in the characteristic changes in proportions during early human development. However, genetic factors can produce maximum growth only if environmental conditions are adequate, as poor nutrition, frequent injury, or disease can reduce the individual's adult stature ...
Linear growth is a complex process regulated by the growth hormone (GH) – insulin-like growth factor-1 axis, the thyroxine/triiodothyronine axis, androgens, estrogens, vitamin D, glucocorticoids and possibly leptin. [25] GH is secreted by the anterior pituitary gland in response to hypothalamic, pituitary and circulating factors.
Physical development. 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
Morphogenesis is important for creating the three germ layers of the early embryo (ectoderm, mesoderm, and endoderm) and for building up complex structures during organ development. Tissue growth involves both an overall increase in tissue size, and also the differential growth of parts ( allometry ) which contributes to morphogenesis.
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]
A significant concern of developmental psychology is the relationship between innateness and environmental influences on development. This is often referred to as " nature and nurture " or nativism versus empiricism .
Development at this stage also includes periods of reevaluation regarding life satisfaction, sustainment of active involvement, and developing a sense of health maintenance. [41] Developmental conflicts may arise in this stage, but psychological growth in earlier stages can help significantly in resolving these conflicts. [42]