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Postnatal growth refers to the physical, physiological, and developmental changes that occur in a human after birth. It is a complex, continuous, and dynamic process influenced by genetic, environmental, nutritional, and hormonal factors. Human postnatal growth can be studied through changes in body size, shape, and composition, as well as through developmental milestones that mark cognitive, emotional, and motor development. Postnatal growth is typically divided into several distinct phases: infancy, childhood, juvenile, adolescence, and adulthood. 1. Phases of Postnatal Growth a) Infancy (Birth to 2 years): This phase is characterized by rapid growth and development. During the first year of life, the infant's weight typically triples and height increases by about 50%. This period shows the fastest rate of postnatal growth. Brain development is significant, with rapid increases in neural connections and brain volume. There is also the development of sensory and motor skills. The infant develops abilities such as rolling over, sitting, crawling, and walking. Nutritional needs are critical during this period. Breastfeeding is recommended exclusively for the first six months, followed by complementary feeding. Growth during infancy is largely influenced by nutrition, maternal health, and environmental factors such as hygiene and infections. b) Early Childhood (2–6 years): Growth rate slows down compared to infancy but remains steady. ________ ______ _____ _________ _______ __________ _______.
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