What do a loaf of bread & MAC Air have in common?

I had my check-up yesterday morning & I'm starting week 30 of my pregnancy. My doctor shared that the baby is about the length of a loaf of bread & weighs about the same as the Mac Air Book- 3lbs! My stomach feels so tight, I don't know how much room she really has to stretch in there, but she sure wiggles around a lot. I've been pretty much textbook so far, gaining another 4.2 lbs over the last month, but I did get sent for extra blood work to check my absorption of vitamins. Afterwards, my friend Julie & I had lunch, then went to see the Bodies exhibit. We saw several fetus from week 4-28 which really brought so much realization as to what's been happening with our babies' development; much different that looking at a flat image online or in a text book. If you have a chance to go, it really is a fascinating experience!