He's swallowing fluid and kicking up a storm. Vital organs — including his kidneys, intestines, brain, and liver (now making red blood cells in place of the disappearing yolk sac) — are in place and starting to function, though they'll continue to develop throughout your pregnancy.
If you could take a peek inside your womb, you'd spot minute details, like tiny nails forming on fingers and toes (no more webbing) and peach-fuzz hair beginning to grow on tender skin.
In other developments: Your baby's limbs can bend now. His hands are flexed at the wrist and meet over his heart, and his feet may be long enough to meet in front of his body. The outline of his spine is clearly visible through translucent skin, and spinal nerves are beginning to stretch out from his spinal cord. Your baby's forehead temporarily bulges with his developing brain and sits very high on his head, which measures half the length of his body. From crown to rump, he's about 1 1/4 inches long. In the coming weeks, your baby will again double in size — to nearly 3 inches.
1O lord, thou hast searched me, and known me.
2Thou knowest my downsitting and mine uprising, thou understandest my thought afar off.
3Thou compassest my path and my lying down, and art acquainted with all my ways.
4For there is not a word in my tongue, but, lo, O LORD, thou knowest it altogether.
5Thou hast beset me behind and before, and laid thine hand upon me.
6Such knowledge is too wonderful for me; it is high, I cannot attain unto it.
7Whither shall I go from thy spirit? or whither shall I flee from thy presence?
8If I ascend up into heaven, thou art there: if I make my bed in hell, behold, thou art there.
9If I take the wings of the morning, and dwell in the uttermost parts of the sea;
10Even there shall thy hand lead me, and thy right hand shall hold me.
11If I say, Surely the darkness shall cover me; even the night shall be light about me.
12Yea, the darkness hideth not from thee; but the night shineth as the day: the darkness and the light are both alike to thee.
13For thou hast possessed my reins: thou hast covered me in my mother's womb.
14I will praise thee; for I am fearfully and wonderfully made: marvellous are thy works; and that my soul knoweth right well.
15My substance was not hid from thee, when I was made in secret, and curiously wrought in the lowest parts of the earth.
16Thine eyes did see my substance, yet being unperfect; and in thy book all my members were written, which in continuance were fashioned, when as yet there was none of them.
17How precious also are thy thoughts unto me, O God! how great is the sum of them!
18If I should count them, they are more in number than the sand: when I awake, I am still with thee.