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.
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.