Probiotics is a kind of live bacteria preparation, which can promote the balance of flora in the body, promote the survival of beneficial bacteria by inhibiting and killing pathogenic bacteria, and then regulate the gastrointestinal flora, enhance intestinal resistance, and achieve the effect of treating indigestion such as bloating, diarrhea and constipation. 1, improve the symptoms of diarrhea, constipation: probiotics as a kind of external supplement of beneficial flora, after entering the intestine, will even regulate the balance of our intestinal flora, so that the symptoms of diarrhea, constipation, etc. get better, and to some extent will increase the self-regulatory function of the intestine. 2, improve the symptoms of indigestion: probiotics can regulate the micro-ecological state of the intestinal tract, help the baby absorb the nutrients needed to better promote digestion. 3, improve the child’s immunity: the intestine as the body’s immune system regulatory organs, has a very important important, probiotic intake can not only help intestinal peristalsis, but also stimulate the human immune system, enhance the function of the baby’s immune system. 4, reduce the side effects of antibiotics on children: taking antibiotics will kill many useful for our own beneficial bacteria, the disappearance of these beneficial bacteria, will cause our intestinal immune system imbalance, for the baby taking antibiotics, timely supplementation of probiotics, help the body to recover. Generally speaking, it is best to take probiotics two hours after taking antibiotics. Generally after 3 months of birth, infants and children can start to gradually supplement some dairy products containing probiotics, especially children born by cesarean section or prematurely, generally have low immunity, prone to colds and enteritis, and can properly need to supplement probiotics.