Sweet little Lauren,
At 31 weeks, you're 17 inches long (near your birth length!) and around 3.5 pounds already. I wonder if you might be bigger, just based on how strong your movements are. You are squirming constantly and some of your movements are big enough to catch me off guard a little bit. I love feeling (and watching) you move, because it means you're doing well in there. Sorry to tell you, though, that it's about to get too crowded to dance around as much as you've been doing.
Already the size of a pineapple, you're now starting your final growth spurt and your brain and nerves are busy developing. All five of your senses are working, your digestive tract is almost mature, and your lungs now inflate properly. Your fingernails and toenails are fully formed, and you're drinking/peeing up to 1/2 liter of amniotic fluid per day.
You and Daddy are in a race right now to see what happens first - your entrance into the world, or the completion of our house. Either way, we are SO excited to meet you and welcome you into our family!