halfway there, my little sweet potato

Today I am officially 20 weeks pregnant! My weekly e-mail from BabyCenter.com:

Congratulations! You've hit the halfway mark in your pregnancy. By now your baby is about the size of a large sweet potato, and a creamy, whitish substance called vernix caseosa is starting to cover his skin. This coating will protect his skin from weeks of bathing in amniotic fluid but will most likely disappear by the time he's born. Your baby is swallowing more these days, which is good practice for his digestive system.