Week 7. Age Of Fetus 5 weeks.

How Big Is Your Baby?

Your baby has an incredible growth spurt this week! At the beginning of the 7th week, the crown-to-rump length of your growing baby is 0.16 to 0.2 inch (4 to 5mm). This is about the size of a BB pellet. By the end of the week, your baby has more than doubled in size, to 0.44 to 0.52 inch (11 to 13mm).

How Big Are You?

Although you are probably quite anxious to show the world you're pregnant, there still may be little change. Changes will come soon, though.

How Your Baby Is Growing and Developing

Leg buds are beginning to appear as short fins, arm buds have grown longer; they have divided into a hand segment and an arm-shoulder segment. The hand and foot have a digital plate where the fingers and toes will develop.

The heart bulges from the body. By this time, it has divided into right and left heart chambers. The primary bronchi are present; bronchi are air passages in the lungs. The cerebral hemispheres, which make up the brain, are also growing. Eyes and nostrils are developing.

Intestines are developing, and the appendix is present. The pancreas, which produces the hormone insulin, is also present. Part of the intestine bulges into the umbilical cord. Later in your baby's development, it will return to the abdomen.

Changes in You

Changes are occurring gradually. You still probably won't "show," and people won't be able to tell you're pregnant unless you tell them. You may be gaining weight throughout your body, but you should have gained only a couple of pounds this early in your pregnancy.

If you haven't gained weight or if you have lost a couple of pounds, it isn't unusual. It will go the other direction in the weeks to come. You may still experience morning sickness and other symptoms of early pregnancy.