Congenital hypertrophic pyloric stenosis is the most common surgical disorder, with one case in about 1000-3000 newborns in China. It is more common in males, about 4-5:1, mostly in first trimester children, less common in immature children, and has a tendency of family history. Pathology: abnormal hyperplasia and hypertrophy of the pyloric ring muscle fibers, no significant increase in the number of longitudinal muscle fibers, only mild thickening, the entire pylorus is olive-shaped mass, hard texture, smooth surface. Clinical manifestations:1. Vomiting, most of them occur 2-4 weeks after birth, very few appear 3-4 days after birth or as late as 3-4 months. Vomiting is typically regular with progressive exacerbation, from the beginning of milk spillage to jet vomiting, from the beginning several times a day to every time after feeding. The vomit is milk or milk clot and contains sour taste without bile, a few cases may be coffee-colored, this is due to repeated vomiting to stimulate the mucosal capillary damage of the gastric sinus. 2. Jaundice, the incidence of about 2%-8%, indirect bilirubin is mainly elevated. Treatment:Pyloromyotomy. Open or laparoscopic. Abdominal ultrasonography suggests pyloric muscle hypertrophy, prolonged pyloric duct and obstructed passage of contents Laparoscopic observation of pyloric mass