Children generally do not need to take probiotics for a long time, taking probiotics is limited to about 3-6 months at most, probiotics are the most important part of the human intestinal micro-ecosystem, probiotics are usually in the case of children with probiotic deficiency, especially for the micro-ecosystem before the age of 2 is not well established, taking probiotics is beneficial to physical and mental health and disease recovery. There is also an imbalance or lack of intestinal micro-ecosystem, usually under disease factors, especially acute and chronic gastrointestinal infection factors, prone to intestinal micro-ecosystem disorders, when it is better to supplement probiotics. General supplementation of probiotics is also supplementation of clinical symptoms, signs disappear 1 week can be, part of the chronic immune or allergic diseases can eat probiotics for a longer period of time, but not more than about 3 months is appropriate.