Baby D week 13 and 14

Fingerprints have formed on your baby's tiny fingertips, the veins and organs are clearly visible through that still-thin skin, and his or her body is starting to catch up with its head — which makes up just a third of his or her body size now. If you're having a girl, she now has more than 2 million eggs in her ovaries. Your baby is almost 3 inches long (the size of a medium shrimp) and weighs nearly an ounce.

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