Bitsy Progress- Week 13

Week 13 marks a milestone for your baby-to-be. Developmentally speaking she's no longer an embryo, but a fetus. She's looking—and acting—more and more like a baby every day. She appears to be resting because her eyelids have formed and are fused together, but her arms and legs move and twitch (although you probably can't feel it … yet). She can suck her thumb, too. About the size of a peach. The head is still disproportionately bigger than the body, but the rest of the body is starting to catch up. In fact, your baby is growing rapidly these days. The face is starting to look more human, with eyes moving closer together. Toes and fingers are clearly separate, and ankles and wrists have formed. External genitalia are becoming visible. Intestines are shifting into their proper place, too. The vocal chords are well under construction (the first step toward one day saying, "I love you, Mommy!"). Your fetus is about three inches long and the size of a peach at 13 weeks pregnant. But don't compare your fetus with the fetus next door. Starting about now, babies begin growing at different paces, some faster than others, some more slowly, though they all follow the same developmental path. Growing at a universally breakneck speed now is your baby's body as it tries to catch up to the head in terms of size. Though your baby's head is about half the size of its body now, by the time your baby is ready to make his or her entrance into the world, the head will be only one-fourth as large as the body. Your baby's intestines are also in for some big changes right now. Up till this point, they've been growing in a cavity inside the umbilical cord; but now they're moving to their permanent (and more conveniently located) address, in your baby's abdomen. And to serve your growing baby's needs, the placenta is also growing. It weighs about an ounce now and will weigh one to two pounds at birth (something else you'll soon be able to blame your weight gain on!).