Abstract: Depending on the studies about nutrition values and new bioactive factors of common milk and colostrums, especially the discoveries of new kind of bioactive peptides from enzymolysis of milk proteins, many scientists believed that milk played critical significant rule not only in human nutritions but also in the growth, development, evolution, physiology, biochemistry, antibiotic, behavioral, and immunodefences of infants. So one could say that if we had no lactations then we had no mammalian species, and no prosperity of Homo sapiens as well. Many research works showed that this study would become scientific research focus for dietician, food scientists, medicine scientists and Biologist.

Key words: Lactation mammalian , Bioactive factor , Development , Evolution