Congenital hypertrophic pyloric stenosis is a mechanical obstruction caused by hypertrophy and hyperplasia of the pyloric annulus muscle, which narrows the lumen of the pylorus. The incidence in China is 1 per 1,000, and the incidence in men is about four times higher than that in women, especially in first-born men who are more prone to the disease. The disease has a genetic predisposition, with a father with hypertrophic pyloric stenosis having a 5% chance of having a child with the disease in men and 2% in women; if the mother has the disease, the likelihood of having a child with the disease increases threefold. Vomiting is the most prominent and typical early symptom, mostly appearing 2-3 weeks after birth, but in a few cases as early as 2-3 days, with vomiting appearing as late as 4 months later. The vomiting usually starts with milk spillage after eating and occasional vomiting, after a few days the vomiting is frequent, almost every feeding immediately or a few minutes after vomiting, progressive aggravation, gradually becomes jet, when violent can be sprayed to several feet away. The vomit can have a sour odor. After vomiting, there is a strong desire to eat. The diagnosis can be confirmed by ultrasound examination combined with medical history in a specialized hospital. Early diagnosis and timely surgery is the key to cure this disease. If not, the child will be severely malnourished until death. The surgery is minimally invasive laparoscopic surgery with little trauma, fast recovery, few complications, minimal scars and beautiful appearance. No scars after surgery!