Week 14 Developments

How your baby's growing:
This week's big developments: Your baby can now squint, frown, grimace, pee, and possibly suck it's thumb! Thanks to brain impulses, it's facial muscles are getting a workout as it's tiny features form one expression after another. It's kidneys are producing urine, which it releases into the amniotic fluid around it — a process it will keep up until birth. It can grasp, too, and if you're having an ultrasound now, you may even catch it sucking it's 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 — and it weighs 1 1/2 ounces. It's body's growing faster than it's head, which now sits upon a more distinct neck. By the end of this week, it's arms will have grown to a length that's in proportion to the rest of it's body. (It's legs still have some lengthening to do.) It's starting to develop an ultra-fine, downy covering of hair, called lanugo, all over it's body. Your baby's liver starts making bile this week — a sign that it's doing its job right — and it's spleen starts helping in the production of red blood cells. Though you can't feel it's tiny punches and kicks yet, your little pugilist's hands and feet (which now measure about 1/2 inch long) are more flexible and active.