Happened across some interesting research yesterday. Basically what it says is that HcG levels are higher for girl babies, as early as 14-20 dpo. I'm assuming this is the basis for the idea that girl babies mean more morning sickness (since morning sickness is supposedly linked to HcG levels) but given that not everyone's body responds the same to HcG, it seems like looking at the HcG levels themselves would be a much more accurate predictor than asking about someone's morning sickness.
So here's the question--(assuming you're pretty certain of your conception/ovulation dates) did your HcG levels correlate at all with gender? Were they higher than average for your girl baby? Were they lower for your boy?
Here's the article:
http://humrep.oxfordjournals.org/content/17/2/485.full