Your baby is no longer an embryo! Though she's barely the size of a kumquat — just an inch or so long, crown to bottom — and weighs less than a quarter of an ounce, she has completed the most critical portion of her development. This is the beginning of the so-called fetal period, a time when the tissues and organs in her body grow and mature rapidly. Her vital organs — the liver, kidney, intestines, brain, and lungs — are now in place and starting to function, although they'll continue to develop throughout your pregnancy. Her liver continues to make blood cells, and the yolk sac, which previously supplied these cells, is no longer needed and begins to disappear. During the next three weeks, your baby's length will more than double to nearly 3 inches. Her head is proportionately smaller now than it was a few weeks ago, but it's still almost half the length of her entire body. Her forehead temporarily bulges with her developing brain and sits high on her head; it will l...