Fond reminiscences of bygone days from a group of six-year-olds is a bit much. And even worse when the children are unimaginatively scattered over double-page spreads, joined by an inappropriate menagerie--rhinos, koala bears, anteaters--of equally inane animals. ""I used to go to the bathroom in my bed,"" ""I used to suck my thumb,"" and ""I used to say eyeblouse for eyebrows"" are confessions that aren't particularly inventive or perceptive or charming, just tedious. Blatantly saccharine illustrations complete the damage.