Study Smarter with MedSchoolBro on Instagram: "Vote in the poll below 👇 BILIOUS VOMITING IN NEWBORNS — STEP 2 MUST-KNOW 🍼💚 💚 Bilious = distal obstruction (bile means beyond the ampulla). 🌀 Malrotation ± Midgut Volvulus: Diagnose with upper GI series (look for a corkscrew). NPO, NG tube, urgent surgery. ⏳ No meconium in 48 hrs? 🧠 Hirschsprung: Aganglionic distal colon, Down syndrome, rectal suction biopsy (squirt sign). Resection. 🧪 Meconium ileus: Cystic fibrosis, X-ray/contrast enema; Ga