If a newborn fart is watery and yellowish, this is a sign that the child has diarrhea, because in addition to farting a lot, there is also a change in the nature of the stool. First of all, we should improve the routine stool examination to exclude the situation caused by infection, and after excluding the infection, we can give the child probiotics to regulate the gastrointestinal environment. You can also supplement montelukast to protect the gastrointestinal mucosa, and you should also rule out diarrhea caused by lactose intolerance or allergies. In these cases, you can switch to desensitized formula or give oral lactase treatment. Physiological diarrhea can occur soon after birth, but it does not affect growth and development or other conditions, except for the high number of stools. Then there is no need for special treatment, when the newborn grows up, after the increase of complementary food will slowly improve.