My son is 4 and a half and over the last few months has developed a habit of saying something and then repeating the same phrase in a whisper afterwards, he does not do it all the time - but enough for me to notice! None of his friends do it, just wondering why he does it and if it is a normal stage of development.
He does like to learn new things and to retain information - is he repeating things so that he remembers them?