About the Littluns:
The Littluns are young boys, about the age of six, that are stranded on the island with the other boys. These boys were much smaller than the others because of how much younger they were. They don't play too much of a role in the novel, so they were sort of left to take care of themselves. They didn't contribute much to the civilization, so the older boys somewhat ignored them; however if the older boys did order them to do something they were quick to follow the command.
The Littluns' Growth:
The littluns started are young boys, so they don't grow too much in the book. You can say they probably became a little more mature because they had to learn how to survive without their parents. That was probably really hard for a young boy
Theme:
The littluns really exemplify the youth of the group of boys. They show how the boys are young and have to take care of themselves.
Visual Aid:
https://mail.google.com/mail/u/1/#inbox/1481cfa7e0a0717d?projector=1