What's up with your baby's growth this week? She now weighs a full 2 pounds and measures 14-plus inches long.

Your baby will soon be feeling a little cramped in your uterus — but not to worry, there's still plenty of space in there to grow. It just means your tiny gymnast will have less room for those somersaults, cartwheels, and other Olympic feats.

Baby’s eyes open

Look who's looking! It's your baby! Those little eyes — which have been closed for the past few months so that the retina (the part of the eye that allows images to come into focus) could develop — are beginning to open at 26 weeks pregnant.

That means your baby is able to see what's going on now, though unfortunately the view in your uterus isn't all that exciting.

But do try this at home for kicks: Shine a flashlight at your stomach. Your little peanut might kick in response — as in: "Get that light out of my eyes!"

Right now, the iris, which is the colored part of the eye, still doesn't have much pigmentation — that'll fill in over the next month or two — so it's too early to start guessing your little one's eye color.

And even the color your baby is born with might not be the permanent shade. You may be kept guessing until she's a year old, with the most dramatic changes occurring by about 6 months.

Brain-wave activity kicks in

Look what else is going on this week: Your baby's brain-wave activity is gearing up at this stage in fetal development, which means your little one can not only hear noises but can now also respond to them. Not in so many words, of course, but with an increase in pulse rate or movement.

Protruding navel

At 26 weeks pregnant, you're two-thirds of the way through your pregnancy and your uterus is about 2½ inches above your belly button. And speaking of your navel, have you noticed that it's taken on a life of its own — a larger-than-life life?

A newly outie belly button may not be your idea of forward fashion, especially when you have a navel piercing or when your once innie belly button now bulges through tight clothes, but it's de rigueur for the pregnant set. And it's easy to understand why.

Beginning somewhere around the middle to end of your second trimester, your blossoming uterus swells enough to push your abdomen forward, making your navel pop out like a timer on a well-done turkey — even though you have a way to go before your baby is "well-done." Your belly button should revert back to its regular position a few months after delivery — though it may have that stretched-out, "lived-in" look.

While you may need to take out your belly button piercing if it gets too tight, try to look on the bright side: It gives you a chance to clean out all the lint that's accumulated there since you were a kid.

Insomnia

If a full night's rest has become elusive, welcome to the (sleepless) world of pregnancy insomnia.

Between heartburn and leg cramps, and bathroom runs and that big beach ball (with its protruding navel!) beneath your nightie, it's no wonder your body's having trouble calming down and drifting off.

But there are lots of tactics to try that should help keep you in bed instead of pacing the floor, including getting daytime exercise, breathing in daily dose of fresh air, and limiting fluids before you hit the hay.

Baby's movements in the womb

Feel like you're carrying the Karate Kid with all the kicking going on? Your baby is actually practicing all kinds of movements that will eventually be used in life on the outside — including pedaling against your belly, a sort of pre-walking skill.

As your baby's nervous system becomes more developed, fetal movements will become much more coordinated. And as she gets bigger and stronger, those movements will become much more powerful...and occasionally, even painful to you. If your baby lands a good one, that tiny left hook might hurt — a lot.

Another trick she may try — stretching that leg out so far that the foot becomes lodged between your ribs. Next time you come under attack, try changing positions or doing some stretches of your own. You can also gently push your baby back with your hand when your knee-jerker jerks a little too hard. You just might be able to send your little slugger back into the corner of the ring!