This week's big developments: baby can now squint, frown, grimace, pee, 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. From head to bottom, he measures 3 1/2 inches and he weighs 1 1/2 ounces. His body's growing faster than his 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. He's starting to develop an ultra-fine, downy covering of hair, called lanugo, all over his body.
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