According to the Experts: Week 12 August 17, 2008

This week marks a turning point for your baby. The herculean task of developing new bodily structures is nearing an end as most of your baby’s systems are fully formed. Now comes the maintenance phase, during which your fetus’ systems continue to mature for the next 28 weeks and the organs get to work.

Your little fetus weighs as much as half an ounce now, and the crown-to-rump length is about two and a half inches (the size of a large plum — busily working his or her way through the whole produce department). It’s hard to believe (especially from the outside, since you’re probably barely showing at this point), but your baby has more than doubled in size during the past three weeks.  And that’s just on the outside — there’s plenty going on inside too. The fetal digestive system is beginning to flex its digestive muscle — literally — as it starts practicing contraction movements, a skill your baby will need after birth to push food through the digestive tract. The pituitary gland at the base of the brain has started producing hormones. And the bone marrow is making white blood cells, which will one day help your baby fight infection (including all those germs passed around the snot-nosed playgroup).

If you haven’t already had the pleasure, it’s likely that at this month’s checkup you’ll finally hear your baby’s heartbeat — a sound that will make your heart race with joy!

According to the Experts: Week 11 August 17, 2008

Slightly more than two inches long now and weighing about a third of an ounce, your fetus is growing by leaps and bounds. And so is his or her head, which is equal in length to the rest of the body (don’t worry — all fetuses are top-heavy).

On the crown of that large head (and over the rest of the body), hair follicles are forming. Fingernail and toenail beds begin to develop this week and by next week, the nails themselves will start to grow (so don’t forget to add a baby nail clipper to your to-buy list).

Your baby’s body is straightening and his or her torso is lengthening (sounds like a yoga pose, doesn’t it?). Other poses your baby can assume now: stretches, somersaults, and forward rolls. And while you can’t tell this baby’s gender by its cover yet, testes are developing if it’s a boy and ovaries if it’s a girl.

According to the Experts: Week 10 August 17, 2008

Your baby’s growth is fast and furious now. He or she is nearly an inch and a half long and the size of a prune, but not nearly as shriveled (even with all the time it spends in water). In fact, your baby is really taking a human shape now. Bones and cartilage are forming, and small indentations on the legs are developing into knees and ankles. The arms (complete with elbows) can flex already, but don’t run to the store for a baseball bat just yet. Though your baby’s arms are taking shape and getting stronger, each one is only about the size of this number 1.

The tooth bud fairy is making her appearance this week, heralding the arrival of your baby’s little choppers, which are forming under the gums. (Those pearly whites won’t break through the gums until your baby is close to six months old). Other systems are go, too. Your baby’s stomach is producing digestive juices, the kidneys are producing larger quantities of urine, and, if your baby’s a boy, he’s already producing testosterone (yikes!).

According to the Experts: Week 8 August 17, 2008

How’s your baby measuring up this week? At a length of about half an inch right now, your baby has graduated from blueberry-sized to raspberry-sized. But weekly growth is getting a bit hard to estimate, and here’s why: Growth occurs at about the rate of one millimeter each day, but that growth isn’t necessarily just in height.  Spurts can occur in the arms, legs, back, and other parts of your baby’s body. So, big changes will be occurring every which way in the coming months.

What else is changing at eight weeks pregnant? A close-up view of your little embryo (say cheese!) would reveal a more baby-like appearance (and thankfully, a less reptilian one). You’d see an upper lip forming, the protruding tip of that cute button nose, and tiny (and very thin) eyelids. And check out those hands and feet! Your baby’s webbed fingers and toes are differentiating now, so give your baby a round of applause.

All this growing is exciting for your baby too. How do you know? His or her heart is beating at the incredible rate of 150 times per minute. (That’s twice as fast as your heart beats.) Your baby’s digs are growing, too. Amniotic fluid increases at a rate of about two tablespoons per week to accommodate your womb’s growing tenant.

According to the Experts: Week 9 August 17, 2008

Your baby has ended his or her embryonic stage and is entering the fetal period now (good-bye embryo, hello fetus). Your fetus is now about one inch long, the size of a medium green olive (but no martinis, please). The head has straightened out and is more fully developed, the ears are much more prominent, and some new organs (the liver, spleen, and gallbladder) are forming. Your fetus is also making spontaneous movements of his or her arms and legs now that minuscule muscles are beginning to develop, though you won’t feel your tiny dancer for at least another two months.

While it’s way too early to feel anything, it’s not too early to hear something (possibly). Your baby’s heart is developed enough — and grown large enough — so that its beats can be heard with a Doppler, a handheld ultrasound device that amplifies the lub-dub sound the heart makes. But don’t worry if your practitioner can’t pick up the sound of your baby’s heartbeat yet. It just means your shy guy or gal is hiding in the corner of your uterus, or has his or her back facing out, making it hard for the Doppler to find its target. In a few weeks (or at your next visit) the miraculous sound of your baby’s heartbeat is certain to be audible for your listening pleasure.