From Baby Center: Welcome to your second trimester! This week’s big developments: Your baby can now squint, frown, grimace, pee (ewww!), and possibly suck his thumb! Thanks to brain impulses, his facial muscles are getting a workout as his tiny features form one expression after another. His kidneys are producing urine, which he releases into the amniotic fluid around him — a process he’ll keep up until birth. He can grasp, too, and if you’re having an ultrasound now, you may even catch him sucking his thumb. In other news: Your baby’s stretching out. From head to bottom, he measures 3 1/2 inches — about the size of a lemon…

From Baby Center: Fingerprints have formed on your baby’s tiny fingertips, her veins and organs are clearly visible through her still-thin skin, and her body is starting to catch up with her head — which makes up just a third of her body size now. Your baby is almost 3 inches long (the size of a medium shrimp) and weighs nearly an ounce. This is the last week of your first trimester, and your risk of miscarriage is now much lower than earlier in pregnancy. Next week marks the beginning of your second trimester, a time of relative comfort for many women who see early pregnancy symptoms such as morning…

From Baby Center:The most dramatic development this week: reflexes. Your baby’s fingers will soon begin to open and close, his toes will curl, his eye muscles will clench, and his mouth will make sucking movements. In fact, if you prod your abdomen, your baby will squirm in response, although you won’t be able to feel it. (after we read this, I started to poke both sides of my belly and laughed that the baby didn’t know which way to move. Kenny didn’t think it was very funny!) Meanwhile, nerve cells are multiplying rapidly, and in your baby’s brain, synapses are forming furiously. His face looks unquestionably human: His eyes have…