During the first year of an infant's life, physical growth is the most remarkable thing. The infant's weight is doubled in six months and tripled in one year. During growth, not only does weight and height increase, but so does the head and chest, leading to the development of the heart, brain, lungs, and several organs used for survival. The infant's bones begin to harden as does the skull. By the end of the second year of an infant's life, its brain has developed 75% of its adult weight. The growth and size of the baby also depends on his diet during the mother's pregnancy and during his life, if during the mother's pregnancy he did not follow a nutritional diet, the baby could later have difficulties in his growth and even his ability to understand and process things, if the infant is overfed during the first year or two, this could cause obesity in later years, now, if the baby is given a balanced diet and nutritionally, this should increase its growth and size. There are three types of engine development such as Gross moto...