Imaginary friends are a useful tool for kids

Children are quite aware it’s pretence. “Most, if interviewed, say ‘I made it up’. Occasionally, you get a child who insists the friend is real. At a certain stage, children become aware that an imaginary friend isn’t [socially] acceptable.”
Research shows first or only children are more likely to create an imaginary friend, as are children who don’t watch too much TV. It’s a phenomenon that reflects opportunity, says Hannan.