Who are the littluns in Lord of the Flies? Brielfy tell about their condition being lost in the island.

The littluns make up the younger population of boys
stranded on the island in Lord of the Flies.  Golding dedicates the first part of
chapter four to provide characterization for this group of
characters:

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"The undoubted littluns, those aged about six,
led a quite distinct, and at the same time intense life of their own"
(59). 

The narrator details
their lifestyle on the island as one primarily concerned with picking and eating fruit
and playing in the sand on the beach.  At night, "they suffered untold terrors in the
dark and huddled together for comfort;" as the notion of a beast is introduced, their
fear becomes increasingly significant (59).  The presence of the littluns influence both
Jack and Ralph's leadership.  By building shelters and making rules to keep life on the
island orderly, Ralph's actions reveal him to be concerned about taking care of the
littluns and providing for their needs.  Jack, on the other hand, plays on the littluns'
weakness and fear, using their terror of the alleged beast to frighten and control the
other bigguns.