You are called to the bedside to evaluate a 6 week old forme…

You are called to the bedside to evaluate a 6 week old former 28 week male infant due to concern for abdominal distension. He has been receiving full feeds of maternal EBM fortified with human milk fortifier with history of good toleration. He has been stable on 3 LPM high flow nasal cannula in < 30% FiO2 for over 1 week.  Your exam findings are significant for: severe abdominal distension with guarding and tenderness, tachypnea, tachycardia, cool extremities and prolonged capillary refill time. The bedside nurse notifies you that the baby had a normal abdominal exam 3 hours prior but has been having apnea and bradycardia frequently throughout the day. You note the oxygen requirement is now up to 50% FiO2.  You obtain a KUB that is significant for dilated bowel gas pattern and diffuse pneumatosis throughout the distal small intestine and throughout the colon. You request a blood pressure and it is normal. This baby is demonstrating signs of which of the following stages of shock?