In comparison, newborn babies have barely any blood. A newborn baby weighing between 5 and 8 lbs. (2.3 to 3.6 kg) has only about 1 cup (0.2 liters) of blood in their body. In adults, blood contains about 0.8 gallons (3 liters) of plasma, red blood cells, white bloods cells and platelets.
A baby can not taste salt until they are 4 months old. The delay may be related to the development of kidneys, which start to process sodium at about that age. Within a few days of birth, a baby can distinguish between the touch of bristles that are of different diameters.
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