Summary: On the health and risk of various diseases including functional disorders of the gastrointestinal tract in infants and young children may also affect the condition of the gastrointestinal microbiota – disorders / dysbiosis with can be modified by supporting the disturbed microbiota with probiotics and positively influencing the achievement of the microbiotic balance (eubiosis). However, it should be remembered that probiotics – each in different way – affect the gastrointestinal ecosystem and propose probiotics with documented positive in randomized scientific studies.