Wednesday, February 28, 2007
Welcome to your second trimester! This is a big milestone in your pregnancy because it marks the end of a critical development period for your baby. All the basic structures of your baby's body — internally and externally — are formed now. Of course, they're still very tiny. Head to bottom, your baby is just 3 1/2 inches long — about the length of a lemon — and weighs about 1 1/2 ounces.
Your baby's body is growing faster than her head, which now sits upon a more well-defined neck. By the end of this week, her arms will have lengthened and will be in proportion to the rest of her body. (Her legs still have some growing to do, though.) She's starting to develop an ultra-fine, downy covering of hair all over her body called lanugo. Her liver starts secreting bile this week, a sign that it's already functioning properly, and her spleen starts contributing to the production of red blood cells.
Your baby's also producing and discharging urine into the amniotic fluid, a normal process that she'll keep up until birth. You still can't feel your baby's movements, but her hands and feet (now half an inch long) are more flexible and active. Thanks to brain impulses, her little facial muscles are getting a workout as she squints, frowns, and grimaces. She can grasp now, too, and she may be able to suck her thumb.
Wednesday, February 21, 2007
Here is what the internet has to say about week 13.
"Your belly may soon be big enough to announce to the world that you're expecting, but your baby is still tiny. In fact, he's only about 3 inches long, crown to rump — roughly the size of a jumbo shrimp — and weighs just about an ounce. Despite being so small, there's a fully formed baby inside your womb now who's much more proportional than he was a few weeks ago. In previous weeks, your baby's head dwarfed the rest of him — but now his head is only about a third the size of his body. His tiny, unique fingerprints are already in place. His kidneys and urinary tract are functional, and he's starting to urinate out the amniotic fluid he's been swallowing. As you start your second trimester, most of your baby's critical development will be completed, and your odds of miscarriage drop considerably."