When the baby is hungry and wants to eat, when the diaper is wet and needs to be changed, when it is too cold and too hot and needs to change clothes, when there is nothing to do, it may also want to pronounce, this is a normal request and belongs to the physiological phenomenon, this kind of crying sound is usually not particularly high. However, there is another situation where the baby expresses discomfort and pain, crying high and long, and sometimes the body shakes, which is a pathological phenomenon. The common causes of pathological crying are the following. When a child has a nasal blockage when he or she has a cold, he or she can only breathe through the mouth when the nose is seriously blocked, and when feeding the baby in this case, the child will cry because he or she is very uncomfortable. If the baby’s skin folds and rotten or does not clean up the buttocks in time after pooping, red buttocks are also a reason for the child to cry. If the child eats too much or adds starchy food too early when breastfeeding, the child swallows too much air and the food is not fully digested and absorbed, causing the stomach to expand, the child will vomit and cry. Children who are lactose intolerant will also cry because of abdominal discomfort, which often causes colic. Babies also cry when they have intussusception, inguinal hernia impaction, colic of unknown origin, and other surgical diseases. In conclusion, there are many reasons why a baby may cry, so parents must observe carefully to clarify whether it is physiological or pathological, and then actively treat the symptoms.