sunshinebaby - in the later stage of pregnancy, usually bb's head will be in between the pelvic area (that's the time when you feel like peeing all the time), that's called 'lightening' aka engage.
when bb head is on top/on the side, its called breech position, and that usually calls for c-section (depending on the gynae really).
for myself, bb head used to be on top, but now has turned down, but gynae advised not engaged yet...i heard that once bb head is engaged, labour can be quite soon.
hope this helps