I really never pay into them except for the heart beat one. All of my boys had a fetal heart rate faster than my little gal. (Isn't it the other way around?)One that I heard when I was pregant with my 4th is that I need to watch out...I'm more likely to have twins. My dad was a twin, I'm getting older and have already had 4 babies. I was told that this time around I really better watch. Any truth to this>BTW, just found out I'm due with #5!