The early symptoms of infantile intussusception mainly include abdominal pain and vomiting. The abdominal pain is typically paroxysmal and severe, manifesting as acute, intermittent colic. The child may cry and be restless, curling up with knees drawn in, and may appear pale. The abdominal pain eases after several minutes or more, but reoccurs every ten to twenty minutes. Vomiting mainly involves reflexive vomiting of curdled milk or food residues. In later stages, bile and fecal-like liquid may be present, indicating intestinal obstruction.