You wouldn't want to believe that something like 'A child called 'It' was all made up, but there are people who think that it might be... and they raise some very interesting points...

http://msgboard.snopes.com/message/ultimatebb.php?/ubb/get_topic/f/28/t/000609/p/1.html

When I first read the book, I believed it, but now I'm on the fence... the most interesting points to me is the fact that he called his brother 'semi-retarded' when he said that David wasn't abused at all, and the fact that noone saw the scar that his mother had supposedly inflicted in him with a knife...

It's the absence of the scar [David's mother stabbed him with a knife] that bothers me - if there was good evidence that he did, in fact, have that scar, then I'd believe the book...