At nine inches and more than a pound and a half in weight, your baby is taller than two juice boxes stacked one on top of the other, and almost as heavy as four of those little boxes (an analogy you'll find particularly apropos in a few years, when those juice boxes start taking over your refrigerator, your pantry, your car.…).
 
Don't look now (as if you could), but your baby's skin is turning pinker. No, not because he or she's getting overheated (in fact, the amniotic fluid is perfectly climate controlled, keeping your baby at an always comfortable temperature), but because small blood vessels, called capillaries, are forming under the skin and filling with blood. Later this week, blood vessels will also develop in your baby's lungs, bringing them one step closer to full maturity — and one step closer to taking that first breath of fresh air. But those lungs are still very much works in progress. Though they are already beginning to develop surfactant, a substance that will help the lungs expand after the baby is born, the lungs are still too undeveloped to sufficiently send oxygen to the bloodstream and release carbon dioxide when he or she exhales.

The lungs aren't the only system that's gearing up for air intake. Your baby's nostrils, which have been plugged up until now, are starting to open this week. This actually allows your little one to begin taking practice breaths. (Of course since there's no air in there, your baby is really only "breathing" amniotic fluid, but it's the practice that counts, right?)

Your baby weighs more than a pound and a half right now and sports a crown-to-rump length of about eight and a half inches (standard letter size!).
 
Wondering what (and who) your baby will look like?  If you had a baby cam, you'd almost be able to tell by now.  That beautiful face (though still tiny) is almost fully formed.  What's still missing from the picture is the fat that will be piled on under baby's skin.  Until those fat deposits are made, that very tender skin is still very transparent, which means a close look would let you see clear through to all the organs, bones, and blood vessels. Fortunately, that see-through look won't last much longer. Babies at this point are gaining about six ounces each week — with much of that gain coming from fat, in addition to growing organs, bones, and muscle.

What's been playing on your little rocker's stereo system these days?  All kinds of sounds: from air exhaling from your lungs (deep breath now), those gastric gurgles produced by your stomach and intestines, your voice and your partner's (which your baby will be able to recognize at birth), and even very loud sounds such as honking horns, barking dogs, or a wailing fire truck.

Guess what? Your baby has finally broken the one-pound mark. How heavy is that? Hold a one-pound box of sugar in your hand the next time you're in the grocery story (and expect people to ask you why you're grinning from ear to ear). Is the box eight inches long? That's about the length your baby is too!  
 
This week, your sweetie is making more sense of the world as he or she develops the sense of touch. In fact, your little one's grip is quite developed by now — and since there's nothing else to grab in utero, he or she may sometimes hold on tight to that umbilical cord (don't worry — it's tough enough to handle it). The sense of sight is also getting more developed. Your fetus can now perceive light and dark much better than before (even with those fused eyelids). But remember — unless you're shining a flashlight over your belly (which you can do, by the way), it'll be mostly dark for your baby inside that cozy womb of yours.

Moving up from the eyes, the eyelashes and eyebrows are well formed now — and even more hair is sprouting atop that cute little head. You'd be quite surprised, though, if you could see your little one up close and in color. Hair at this stage has no pigment, so it's bright white.

At about seven inches in length and almost 11 ounces in weight, your baby is about the size of a large banana.
 
By now, your baby swallows at least several ounces of amniotic fluid each day —  not only for hydration and nutrition, but also to practice swallowing and digesting — skills your baby will need as soon as he or she arrives in your arms. And keep this in mind: The taste of the amniotic fluid differs from day to day depending on what you've eaten (spicy enchilada one day, sweet carrots another). And that smorgasbord of tastes won't be lost on your baby. That's because your little one has very developed taste buds already. In fact, researchers have noted that babies who were exposed to certain tastes in utero via the amniotic fluid were more eager to eat foods with that same taste after birth. Want your baby to eat his or her broccoli later?  Eat yours now!
 
Your baby still has a great deal of room in your womb — though like anyone who lives in one space for a long time, this tenant will soon begin to feel cramped. Until those uterine walls start closing in, however, there's plenty of space for twisting, turning, and even an occasional somersault (so that's what you were feeling last night!). 

You've got a heavyweight in your belly now (well, in baby terms, anyway).  Your little champ weighs about ten ounces and has a height, crown to rump, of about six and a half inches. Think small cantaloupe (and probably as sweet too).  

Is it a boy cantaloupe or a girl cantaloupe? If you're carrying a girl fetus, her uterus is fully formed this week and her vaginal canal is starting its development (which means that in about twenty-five or thirty-some-odd years, she could be just where you're at, Grandma!). She also has primitive eggs in her tiny little ovaries now, seven million of them — though by the time she's born, that number will be down to two million (still more than she could ever hope to use). And interestingly, your baby girl will be born with all the eggs she'll ever have.  

Have you got male? If your fetus is a boy, his testicles have begun their descent this week, though they're still located in the abdomen, waiting for the scrotum to finish growing so they'll have a place to drop into in a few weeks.

Though the external genitals in both male and female fetuses still have a way to grow, you should be able to find out the sex of your baby (if you want to) during an ultrasound exam.

Six inches long this week and about eight ounces in weight, your baby is the size of a large mango.
 
Your little action figure is able to choreograph Matrix-like moves by now. Arms and legs are finally in proportion, neurons are now connected between the brain and muscles, and cartilage throughout the body is turning to bone. All these upgrades combine to give your baby more control over limb movements. Which explains all that kicking, stretching, and bodysurfing (or rather bellysurfing) you've possibly started feeling by now. 

Something else going on this week: Your baby is getting a cheesy varnish. Say what? Yup — a protective substance called vernix caseosa (vernix is the Latin word for varnish; caseosa is cheese) now covers your baby's skin. It's greasy and white and is made up of lanugo (that downy hair), oil from your baby's glands, and dead skin cells. This waxy "cheese" may not sound too appetizing or attractive, but it's there for good reason: Vernix protects your baby's sensitive skin from the surrounding amniotic fluid. Without it, your baby would look very wrinkled at birth (sort of what you'd look like if you soaked in a bath for nine months). Some babies — especially those born early — will still be covered with vernix at the delivery, so you might get a look at your baby's first anti-wrinkle cream.

This week your baby is hitting the height chart at five and a half inches long (remember, that's crown to rump) and weighs about five ounces (the weight of that boneless chicken breast you're making for dinner).
 
And now for the skill of the week (drum roll please…): The art of the yawn has been mastered by your baby (someone's sleepy!).  In fact, you might catch a glimpse of that adorable yawn if you're getting an ultrasound this month. You'll also catch a glimpse of all the movement your baby's doing — twists, rolls, kicks, and punches. And would you believe your baby is finally big enough for you to start feeling those movements now (or anytime in the next few weeks). So get ready!

Something you won't see on the ultrasound, but you'll know is in working order, is your baby's nervous system, which is maturing rapidly at this time.  Nerves, now covered with a substance called myelin (which speeds messages from nerve cell to nerve cell), are forming more complex connections. And those in the brain are further specializing into the ones that serve the senses of touch, taste, smell, sight, and hearing. Talking about hearing, your baby's is growing more acute, making your little one more conscious of sounds that come from inside your body (which means you could both be listening to each other hiccup  — a skill that your baby has by now).

Listen up: Tiny bones in your fetus's ears are in place this week, making it likely that the baby can hear your voice when you're speaking (or singing in the shower). In fact, studies have found that babies who are sung to while they're in the womb recognize the same tune when it's sung to them after they are born (so choose your baby Muzak with that in mind…). 
 
And baby's busily boning up in other ways. For one, the backbone (along with the back muscles) is stronger now — strong enough, in fact, to enable your baby to work on straightening his or her head and neck even more. Baby's crown-to-rump measurement is between four and five inches in length, and weight is hovering around three ounces.

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!).