I've always found these studies to be fascinating - perhaps we're just a cookie cutter family, but they've always seemed quite accurate. I'm the oldest of four, and the only girl, so I know a lot of stereotypes apply to me and I've found (grudgingly) that many of them are true. (I think sometimes I feel more like an only child just because the others are boys.) The funniest thing is really that my two youngest brothers are twins, and not only do they fit the general twin sterotype but they also seem to fit the birth order ones. Mark (who was born first) acts distinctly like a middle child and David (born seven minutes later) acts like the youngest. It's mostly weird because I highly doubt we've ever treated them much differently - the only distinction in age we ever make between them is when we do things from oldest to youngest. I don't know why, but I guess that was enough to set them apart.

Anyway, hope you find what you're looking for with this!