Check out what happened with your little one's development last week.
Congratulations! The embryo inside you gets a new name this week—the official designation is now fetus. And this fetus is looking less and less like a pink blob. The tail has disappeared and the body shape is now emerging, thanks in part to the elongation and straightening of the trunk area. Your fetus measures about 1 inch long this week.
Growth spurt. This is a critical period for arm and leg development. The legs have lengthened, and the buds that will eventually become the toes have started to sprout. Meanwhile, the arms have gotten longer and have begun to bend at the elbow. A basic hand structure is forming too, with the fingers and thumb clearly differentiated. The abdomen is developing as well: The structures that will be the liver, gallbladder, spleen, and adrenal gland are becoming specialized.
On the go. This is the beginning of the dance period! Your little one has started moving vigorously, even in response to stimuli from outside your body, such as light and noise. But you won't be able to feel this action until well into your second trimester.
Make way for milk. By now, you've probably noticed significant changes in your breasts. They're likely fuller and heavier and may be tender to the touch. Though your breasts will continue to enlarge somewhat as your pregnancy progresses, the sensitivity will subside, usually by the end of your fourth month. You may start to see small white bumps on your areolas (the dark-colored part of your nipple); they're called Montgomery's tubercles, glands that produce oils to keep your nipples moist when you start breastfeeding.
Smooth moves. If you weren't active before you got pregnant, now is a great time to choose a safe activity you can stick with for the rest of your pregnancy. Swimming, walking, and yoga are all excellent choices. Many experts consider swimming, in particular, to be the best exercise for pregnant women. Swimming not only gives you a great cardiovascular workout but also is gentle on your joints, which are more injury-prone during pregnancy. The hormone relaxin makes your joints looser so your pelvis can expand during birth; consequently, you should avoid exercises that could put too much strain on your joints, like full sit-ups or reaching for your toes. For more information on exercising during pregnancy, click here.
From the experts. Eating cheese is a great way to get your calcium quotient, but you should stay away from soft cheeses, like Brie, while you're pregnant. "Soft cheeses can contain a bacterium called listeria, which could be harmful to you and your baby," explains Margaret Comerford Freda, Ed.D., R.N.