During the childhood, the physical development is more rapid in infancy. From birth to eight years old, it is a time of tremendous growth. Between birth and age three a child ordinarily doubles in height and quadruples in weight. Body proportions shift, in order for the infant whose head is almost one-fourth of its body weight altogether now is a toddler with a more balanced, adult-like appearance. Around this age a typical three year old will have mastered walking, sitting, scribbling, toilet-training, using a utensil, and sufficient eye-coordination despite rapid growth. Between ages five and three children will have developed fine-motor skills. Physical growth typically slows down between five and eight years old, whilst body proportions and motor skills are becoming more sufficient. Children also develop a spoken vocabulary that ranges between 300 and 1,000 words within the first three years of life.
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the study of living organisms, divided into many specialized fields that cover their morphology, physiology, anatomy, behaviour, origin, and distribution.
