How your baby's growing:Head to bottom, your baby is approximately 5 1/2 inches long and she weighs almost 7 ounces. She's busy flexing her arms and legs — movements that you'll likely start noticing more and more. Her blood vessels are visible through her thin skin and her ears are now in position and stand out from her head. Myelin (a protective covering) is beginning to form around her nerves, a process that will continue for a year after she's born. Her uterus and Fallopian tubes are formed and in place.
How your life's changing:Bigger, more comfortable clothes are a must now as your appetite and waistline increase. Look for specially designed maternity clothes that can accommodate your expanding belly.You may have heard that you should avoid lying on your back during your last two trimesters. Here's why: When you lie flat on your back, your uterus can compress a major vein (called the inferior vena cava) that returns blood from the lower half of your body back to your heart. Lying on your side (or even partially tilted to the side), particularly your left side, prevents this compression and improves your blood flow. Try placing a pillow behind you, or under your hip or leg for comfort.Your cardiovascular system is undergoing dramatic changes, and during your second trimester your blood pressure is probably lower than usual. Don't spring up too fast from a lying or sitting position or you might feel a little dizzy.
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