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Sorry he has this problem. Please fill his external ear canal with slightly warmed mineral oil, or liquid paraffin (even spirit or gasoline will do but can not warm these) keeping the opening facing up. Allow some time for the bug to drown in fluid and then turn the head so the ear opening faces down.
If the bug is small, and sticks to wall, a dead one will not disturb the child and you can visit health workers in ER any time for removal.