Closed for business. An important milestone occurs this week: The neural tube, which began to form last week, starts to close over what will become your baby's spinal cord.
Face forward. Although the embryo still looks somewhat like a tiny tadpole, folds of tissue are developing at the top, and these will eventually become your little one's chin, cheeks, and jaw. The areas that will be the eyes and nose have started to project as bumps, and the inner-ear structure is pushing inward.
Picking up the beat. The heart tube, which formed last week, continues its development as it gradually grows into four primitive chambers and starts to beat like a tiny drum. Other major organs, such as the kidneys and liver, are also beginning to take shape. The lungs each exist as a single tube, and they're starting to form into pouch-like structures; they've got lots of blossoming to do before they're ready for air.
Measuring up. Your little one keeps growing bigger, now measuring about 0.1 inch, or 2.5 millimeters.
Conditions with a cause. The changes your body undergoes in early pregnancy, though exciting, can be challenging at times. Remember that every symptom is serving a purpose. Your breasts may be tingling or tender because of increased blood flow; your body is already hard at work getting them ready for breastfeeding. Be sure to wear a supportive bra, even at night if it helps. You may also experience constipation because of an increase in the hormone progesterone, which slows down the digestive tract. To deal with this problem, exercise regularly and eat a balanced diet, including lots of high-fiber foods such as fruits, vegetables, and whole grains. And increase your water intake: Shoot for at least eight glasses a day.
Losing your lunch? About 70 percent of pregnant women experience some morning sickness, with the first trimester being the worst. Nausea is triggered by hCG, the pregnancy hormone that's secreted right after implantation. There are measures you can take to quell queasiness. Click here for suggestions on relieving your symptoms.
From the experts. "The hormone that's causing your morning sickness can also be responsible for headaches," notes Elaine Zwelling, R.N., Ph.D. "Headaches during pregnancy can also be triggered by fatigue, tension, hunger, and physical or emotional stress." Get suggestions from Dr. Zwelling on how to manage hormonal headaches.