Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Medical experts have warned parents that antibiotics can disrupt gut flora in infants! In fact, researchers have revealed that this is the first sequencing-based study which have shown the negative effects of short-term antibiotic treatment on the beneficial gut bacteria populations in infants. In addition to this, science and research have demonstrated that the alteration of the gut microbiota affects the immune system very early in life. Consequently, the antibiotics could negatively influence long-term health, particularly by boosting the risk of developing asthma, allergy and obesity. More importantly, the scientists have made use of advanced DNA sequencing to identify the species of gut flora as well as to quantify their numbers. Indeed, the medical analysis have recorded that the bacteria from the beneficial genera - the Bifidobacteria and the Lactobacilli are forced to diminish in quantity at the presence of antibiotics like ampicillin and gentamicin.