we're week 12 today! :)

How's beanie doing this week:
This week marks a turning point for your baby. At 12 weeks pregnant, 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).

How's mummy doing:
As you near the end of your first trimester, your uterus, now about the size of a large grapefruit, begins to migrate from the bottom of your pelvis to a front-and-center position in your abdomen. If you're lucky, this will bring an end to one pesky early pregnancy symptom — the constant urge to urinate. Also slated to diminish somewhat now that you're on the cusp of your second trimester are some of those other early pregnancy symptoms: nausea, super-tender breasts and nipples, food aversions, fatigue. But don't look now (though — considering the symptom — maybe you should), there's a new one added to the mix: dizziness.

And guess who's to blame? Yup — it's your old friend progesterone again, which causes your blood vessels to relax and widen around 12 weeks pregnant, increasing the flow of blood to your baby (again, good for baby), but slowing the return of blood to you (as always, not so good for mom). Less blood flow to you means lower blood pressure and reduced blood flow to your brain. All of these can contribute to that light-headed, dizzy feeling — especially when you get up too quickly — which is why slow and steady wins the race against dizziness.

Another cause of dizziness during pregnancy is low blood-sugar levels, which can occur if you're not eating regularly (so don't try to run…or even walk…on empty). And looking ahead to later in pregnancy, dizziness in the third trimester can be caused by the pressure the growing uterus places on your major blood vessels, especially when you're lying on your back.

Here's a quick tip: If you feel dizzy or faint, lie down or sit with your head lowered between your knees, take deep breaths, and loosen any tight clothing (like that button on your jeans you struggled to close in the first place). As soon as you feel a little better, get something to eat and drink.