14 Weeks

This week's big developments: Your babies can now squint, frown, grimace, pee, and possibly suck their thumbs! Thanks to brain impulses, their facial muscles are getting a workout as their tiny features form one expression after another. Their kidneys are producing urine, which they release into the amniotic fluid around them — a process they'll keep up until birth. They can grasp, too, and if you're having an ultrasound now, you may even catch them sucking their thumbs.
In other news: Your baby's stretching out. From head to bottom, they measures 3 1/2 inches — about the size of a lemon — and weigh 1 1/2 ounces. Their body's growing faster than their head, which now sits upon a more distinct neck. By the end of this week, their arms will have grown to a length that's in proportion to the rest of their bodies. (Their legs still have some lengthening to do.) They are starting to develop an ultra-fine, downy covering of hair, called lanugo, all over their bodies. Your babies' livers starts making bile this week — a sign that it's doing its job right — and their spleens starts helping in the production of red blood cells. Though you can't feel 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.