Some babies cry inexplicably shortly after birth. What is going on? The baby may have abdominal cramps. The word “abdominal colic” is used here instead of “intestinal colic”. These two words have different expressions. Intestinal colic can be seen at any age. It is a pain caused by the stretching of the striated muscle of the intestinal wall. It is a pain that is really felt. The term abdominal cramps used here only occurred in the early stage of infants (the first 3 months). It is a common manifestation. Infants who have pain can not complain of themselves. Therefore, abdominal cramps are only a speculative abdominal “pain” . So, how does baby’s abdominal cramps behave? Sudden crying of the baby is often the most common manifestation of abdominal cramps. According to the American Academy of Pediatrics, approximately 10%-25% of babies have abdominal cramps. This abdominal cramps initially occurs 2 to 3 weeks after the baby is born, the most frequent around 6 weeks, and then gradually relieves, and most of them disappear naturally by March to April. The baby can have abdominal cramps 1-2 times a day, and sometimes can last for more than 2-3 hours. Between each episode of abdominal pain, the baby’s behavior is normal. The cause of baby’s abdominal cramps is not very clear. Although pediatric experts have observed the occurrence of infant colic, the causes of its occurrence are not yet clear. It is speculated that there may be the following reasons: Viewpoint 1: The earliest speculation of abdominal cramps is that abdominal pain caused by intestinal cramps, the cause of intestinal cramps may be caused by milk powder allergy, lactose intolerance or dyspepsia. 1. Abdominal pain caused by intestinal cramps can occur in children of all ages, but infants with abdominal cramps 3. The symptoms will naturally disappear in April, which is not consistent with intestinal cramps. 2. Milk protein allergy, manifested in crying and noise, vomiting and diarrhea 30 to 60 minutes after breastfeeding, and weight gain is not very good. These babies can eat soy milk powder, protein hydrolyzed milk powder or amino acid milk powder. It is worth noting that only one-tenth of babies who switch to hypoallergenic milk powder will improve symptoms. The American Academy of Pediatrics also does not recommend soy milk powder for babies with abdominal cramps because soy protein allergy is still very high. 3. Lactose intolerance, the fermentation of lactose produces gas, which can cause flatulence and colic. However, only a few milk powders with low lactose will improve. It can be seen that the above points of view do not fully explain the phenomenon of infant colic. Opinion 2: New explanation, according to the circadian clock theory, the occurrence of abdominal cramps may be related to the baby’s psychological unrest. Psychological anxiety period refers to the first two or three weeks after the baby is born, and feels uneasy about the coming of the night. When the baby is still in the fetal period, she is subject to the changes of the maternal hormones during the day and night. Therefore, there is a fixed physiological clock in the mother’s body. After birth, her endocrine function is immature, and she cannot adjust the physiological clock by herself, which can cause crying at night and sleep during the day. As the growth and development, the endocrine function gradually matures, this psychologically uneasy situation will naturally improve. Most infants with abdominal cramps will improve on their own before 3 to 4 months, so it is presumed that the newly born baby cannot adapt to the external environment. Viewpoint 3: There may be other medical problems. Babies cry and quarrel all day, and usually have to consider their medical issues, such as: 1. Reflux esophagitis, babies often cry during or after feeding, and often have galactorrhea. 2. Mother’s food problem, although breastfeeding baby. When your mother eats certain foods, she always cries and tries to stop using such suspicious foods. Mothers who stop eating suspicious foods such as milk or coffee for 2 weeks may improve the baby’s crying symptoms.