In recent years, microbiome has gained attention for its contribution to infant and childhood development. There are trillions of microorganisms residing on human body whose community is referred as microbiota. These microorganisms are believed to play important roles in nutrition, protection from pathogens, and development of the immune response . Microbiome is the collective genomies and gene products of the resident microorganisms living within and on human . The microorganisms that live within and on humans are estimated to be of ten times the number of human cells . The National Institutes of Health sponsored Human Mcirobilme Project to study the composition of the human microbiome . It is believed that humans are a composite of microbial and human cells. As a result, microbial components could contribute to human physiology and predisposition to diseases .