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A child in his first year is called an infant. Infancy is the period of rapid mental and physical growth. At the time of birth, an infant weighs approximately 2.5 to 3 kgs and 50 in length.
After that, the weight is double in six months and triple in the first year. Similarly height also increases by one and a half time within the first year hemoglobin is in maximum quantity in the blood of an infant.
In addition to this muscles grow in size and become stronger. There is a considerable increase in capabilities of brain, kidneys and digestive system in infants.
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Daily diet plays an important role in continuing the infant growth and to make him healthy. The infant suffers from malnutrition if he is not given proper food.