HIGH YIELD: "nonbilous vomiting" means that the issue/obstruction comes before (proximal to) the second duodenum, where bile is released.
At around ~4 weeks (give or take a few) is when pyloric stenosis usually shows up.
ez pts for u now keep it up
obvious answer choices between duodenal atresia and pyloric stenosis.
duodenal atresia presents with bilious vomiting within 1st day of life. other features - double bubble on xray.
whereas pt here has non bilious vomiting at 4th week of life.