Neonatal diarrhea needs to be taken very seriously. The first thing to do is to make a judgment about whether it is diarrhea or not. It is normal for most newborns to have a relatively thin and frequent stool, so don’t scare yourself. However, if there is a significant change in the number of stools and the degree of thinness, special attention should be paid because the little baby has poor self-regulation and there is a possibility of rapid changes in the condition. If the diarrhea is real, you need to find the cause, for example, if you have just changed milk, changed to a different brand, etc. Whether it is a milk protein allergy, eating something dirty, not washing the milk utensils, or having a gastrointestinal manifestation of a systemic infection caused by a viral or bacterial infection are all possibilities, and the treatment options are completely different, so you need to collect some stools and send them to the hospital for an examination. In addition, diarrhea can easily cause dehydration. Small babies have a limited ability to balance water and electrolytes and are very prone to acute severe dehydration and electrolyte disorders, so it is important to ensure adequate feeding to avoid dehydration. In conclusion, after a newborn baby has diarrhea, it is important to actively search for the cause of the disease, to check the stool in a timely manner, and to prescribe the right medicine in order to achieve good results.