The mornings are still pretty rough for me and I'm still very tired. I'm hoping something magical will happen this week and I'll enter into the blissful 2nd Trimester! Check out my belly this week:
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!).
Also developing this week: your baby's vocal chords. Because sound can't travel through your uterus (your baby's current habitat), you won't be able to hear any sounds or cries just yet, but oh boy (or girl) — those vocal chords will get a good workout once that baby is born.
Your baby is 2 1/2 to 3 inches long, the size of a medium goldfish. She weighs about one ounce. Your baby is shorter than a finger, but her face is already showing individual features and characteristics! Her ears are now developed enough that she may be able to hear when you sing, hum, or talk. And her vocal cords will form this week—soon she'll be able to sing back. Your baby spends her time in your womb flexing her new and developing muscles and joints. Bouts of prenatal hiccups are strengthening your baby's diaphragm, which is preparing her respiratory system for breathing. Less glamorous but highly necessary organ systems for making hormones, absorbing nutrients, and filtering waste are also in place this week. The pancreas, gall bladder, and thyroid have developed, the kidneys can make urine, and her bone marrow is making white blood cells to help fight infection after she's born.
Fingerprints have formed on your baby's tiny fingertips, her veins and organs are clearly visible through her still-thin skin, and her body is starting to catch up with her head -- which makes up just a third of 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. As you start your second trimester, most of your baby's critical development will be completed.
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