Fetal stool is the stool formed by the baby in the mother’s body. From 20 weeks of gestation, fetal stool is present in the fetal intestine in a sticky form, 85% to 95% of which is mixed with epithelial cells of the intestinal wall, fetal hair, fetal fat, bile mucus and some solid components of the swallowed amniotic fluid. It is dark green in color, and the closer to the expected date of delivery, the greater the amount of fetal stool. Most normal newborns begin to defecate within 12 hours, and the total amount of fetal stool is about 100 to 200 grams. If the fetal stool is not discharged for 24 hours, attention should be paid to check for digestive tract abnormalities. If the milk supply is sufficient, the fetal stool 2-3 days after the discharge is transformed into normal newborn stool, from dark green to yellow. No fetal stool: refers to the normal anal position of the baby after birth without anus or no fetal stool, caused by congenital malformation of rectal-anal development, mainly with rectal atresia to distinguish. Rectal atresia is a condition in which there is a certain distance between the blind end of the rectum and the anus, due to the incomplete development of the primitive anus during the fetal period, and the symptoms are more severe than those of atresia. The location of the blind end of the rectum and fistula varies, and there are many types of anal anomalies. Delayed fetal stool: The infant has no fecal discharge for 24-48 hours after birth, or only a small amount, or only 3-5 days after fetal stool, and must be treated with enemas or other methods before more feces are discharged. Common diseases are: 1, simple fetal fecal constipation or fetal fecal plug syndrome, 2, congenital intestinal atresia, 3, neonatal peritonitis, 4, neonatal necrotizing small intestine colitis, 5, left hemicolectomy syndrome, 6, hypothyroidism (hypothyroidism), if after treatment fetal fecal excretion, but after a few days there is severe constipation; a few cases after a few days of neonatal intestinal obstruction, there can be weeks, or even months of “remission period”. In a few cases, after a few days of intestinal obstruction, there may be a “remission period” of several weeks or even months, after which persistent constipation occurs again, most likely due to megacolon (anaplasmosis).