PSYO 220 Chapter 3: Chapter 3 The First Two Years Body and Mind
13 Mar 2017
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Document Summary
Chapter 3 the first two years body and mind. In the first two years of life, infants grow longer, gain weight, and increase in head circumference all indicative of development. Birth weight doubles by 4 months, triples by 1 year, and quadruples by 2 years, when toddlers weigh about 12 to 14 kilograms. Complexity increases as well, with cell growth, development of dendrites, and formation of synapses. Experience is vital for brain development: sleep gradually decreases over the first two years. As with all areas of development, variations in sleep patterns are normal, caused by both nature and nurture. Bed-sharing is the norm in many developing nations, and co-sleeping is increasingly common in developed ones. Summary: at birth, the senses already respond to stimuli. Prenatal experience makes hearing the most mature sense. Vision is the least mature sense at birth, but it improves quickly. Infants use all their senses to strengthen their early social interactions.
