Patient’s question: Disease: prenatal checkup has double bubble sign, eating and urinating are normal, what other tests should be done? Description: prenatal checkup has double kidney separation and double bubble sign, on October 4, I went to Changgeng for ultrasound examination of both kidneys, ureter and bladder. The report shows that the left kidney is hydronephrosis, the collecting system is separated about 1.8cm, and the upper part of the left ureter is dilated. The doctor said there is not much problem. What tests should be done for the double bubble sign? Now the baby is 50 days old, eating and urinating and defecating normally, and the baby is always crying and restless. I would like to know if there is any need to check for the double bubble sign. Answer: Hello! The prenatal ultrasound shows double bubble sign, the main clinical consideration is duodenal obstruction, such as duodenal atresia or severe stenosis, poor intestinal rotation, annular pancreas, etc. However, your child was born 50 days ago, eating milk well, normal stool, the above diseases can be ruled out, there is no need to worry. As for the ultrasound that shows left hydronephrosis and ureteral dilatation, it may be due to the abnormality at the entrance of the left ureteral bladder, causing the urine to enter the bladder to be blocked, you can review the ultrasound, if it does exist, if serious, pediatric urology surgery is needed, if less serious, you can follow up. Children with urinary tract obstruction are prone to urinary tract infections, and repeated infections can affect kidney function.