Dear Thanks for contacting with your health concern and following is stepwise approach 1. Infant cannot tell what is wrong. It only cries,so examine from head to toe. a. If everything looks normal, commonest cause is intestinal colic due to hunger, worms & constipation. . feed the baby . give soap stick to empty the bowels . Gripe water: 1 tablespoon thrice daily 2. Consider a Paediatric consultation for symptomwise management: . bulging fontanelle and neck stiffness to exclude meningitis . inspect both ear drums carefully with a good torch for redness/swelling or bulging ear drum . examine the abdomen carefully for lump, distension, visible peristalsis or tenderness.