The present invention relates to the use of bacterial strains belonging to the lactobacillus kefiri species in pediatrics to generate and / or maintain the state of homeostasis. The present invention further relates to bacterial strains belonging to the species lactobacillus kefiri with a high ability to adhere to the intestinal epithelium； in particular, the present invention relates to the bacterial strains lactobacillus kefiri lkf01 dsm 32079 lkef and lactobacillus kefiri lkf02 dsm 32080 for use in pediatrics. finally, the present invention relates to a food composition, or a supplement composition, or a medical device composition, or a pharmaceutical composition (briefly all compositions of the present invention) comprising excipients and / or substances of a formulation pharmaceutical grade and a mixture comprising or alternatively consisting of a bacterial strain selected from the group consisting of the bacterial strains belonging to the lactobacillus kefiri species, said composition for use in pediatrics to generate and / or maintain homeostasis and for use in preventive and / or curative treatment of inflammatory bowel diseases such as irritable bowel syndrome (ibs), inflammatory bowel disease (ibd), crohn's disease and ulcerative colitis (uc) in adults, also at a chronic stage.a presente invenção refere-se ao uso de cepas bacterianas pertencentes à espécie lactobacillus kefiri em pediatria para gerar e/ou manter o estado de homeostase. a presente invenção refere-se ainda às cepas bacterianas pertencentes à espécie lactobacillus kefiri com uma elevada capacidade para aderir ao epitélio intestinal； em particular, a presente invenção refere-se às cepas bacterianas lactobacillus kefiri lkf01 dsm 32079 lkef e lactobacillus kefiri lkf02 dsm 32080 para utilização em pediatria. finalmente, a presente invenção refere-se a uma composição alimentar, ou uma composição para um suplemento, ou uma composição para um dispositivo médico, ou uma composição farmacêutica (bre
