I never really thought much about blood types.  I knew (vaguely) about some problems where baby could have a blood type different from Mom that requires shots (a shot?) while the baby is in-utero.
I didn't realize that one of the risk factors for Jaundice was baby's blood a different type from Mom, though.
I'm O.  I'm positive.  Really.  I'm O positive.
Baby is O negative.
What does this mean?
Baby will be LOVED by the Red Cross.  Her blood can be used for - literally - anyone!  She's got the "Universal Donor" blood type.  What's more, it's a slightly rare type of blood- only 6.g% of the population have that blood type!  Me?  I'm "normal" when it comes to my blood.  I guess that means vampires wouldn't be as interested in little old me.
Here are some quick facts about the United State's distribution of Blood Type (courtesy of wikipedia):
Country Population
307,212,123 
O+ 37.4%
A+ 35.7%  
B+ 8.5%
AB+ 3.4% 
O- 6.6%
A- 6.3%
B- 1.5%
AB- 0.6%
