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(A)腹部超音波檢查是否有幽門肥厚情形
(B)上消化道攝影，以確定阻塞位置及程度
(C)下消化道攝影，看是否有 microcolon
(D)安排開腹手術

the double bubble sign is typically pathologic, and implies either duodenal atresia, duodenal web, annular pancreas, or on occasion midgut volvulus, a distinction that requires close clinical correlation and, in most cases, surgical intervention. 意味著十二指腸閉鎖、十二指腸蹼、環狀胰腺，或有時是中腸扭轉，這種區別需要密切的臨床相關性，並且在大多數情況下需要手術介入

https://en.wikipedia.org/wiki/Double_bubble_(radiology)