Hee, hee, hee! I forgot about all of these "old wives tales" until I saw this thread! I also was told the one about the cat sucking the air from a newborn (my mother-in-law who has a PhD told me that one!!! She wanted me to get rid of our cat!). I also had lots of heartburn, so everyone told me that I would have "hairy" children as well -- at least that tale came true!
Did anyone ever try tying their wedding ring to a string and dangling it over their pregnant belly? Supposedly, if it swings in a circular motion you will have a girl. If it swings back and forth, it will be a boy. Very scientific!!