When Your Child's Best Friend is Invisible

This week, I met a friend of my youngest child, who promptly introduced me to "Buddy," his very bestest friend in the whole wide world (his 4-year-old words, not mine). The problem was, Buddy was nowhere to been seen--or heard--for that matter. Just when I was thinking I must be overly-tired or needing a vision check, his mom explained that Buddy was an imaginary friend. Should Buddy's parents be worried? Relax, say researchers. Read more about what the experts say in When Your Child's Best Friend is Invisible.