Gut or intestinal microbiota inhabit our body and are well nurtured by the body’s ambiance of its preference. Gut microorganisms include bacteria, archae, and fungi that primarily inhabit the digestive tracts of animals. Bacteria like Lactobacillus rhamnosus GG and Bifidobacterium lactis Bb12 have been studied on a wide scale for their potential therapeutic applications. These bacteria are used as probiotics, most often as dietary supplements. They increase the population of the gut microbiota required for normal metabolic activities of the body. Recently, efforts have been made to analyze the effects of these probiotics and gut microbiota in the treatment of various diseases in children. In recent years, research has been conducted to investigate the effects of probiotics and microbiota in the gut on the prevention and treatment of a wide range of childhood disorders. Studies have been carried out to investigate the gut microbiota's effects on the function of beta cells in children recently diagnosed with type 1 diabetes. In this review article, a few applications and research of microbiota on children have been highlighted.