Baby is well on his way to developing tiny arms and legs already. What else is he up to? Select the week of your pregnancy from below and find out the stage of baby's growth.

Week 6 - Umbilical cord forms
By now, your baby is constantly adapting to life inside the womb. The umbilical cord has already formed. It will be your baby's connection to you throughout your pregnancy, providing oxygen and nourishment for your baby and disposing of your baby's wastes. In addition, your baby's digestive tract and lungs continue to form.

Your baby's face is taking shape too. The mouth, nostrils, ears and eyes become more defined this week. The arm bud that developed just last week has a hand on the end of it, which looks like a tiny paddle. Common pregnancy complaints grip you full force this week. You may feel extreme fatigue as your body adjusts to the demands of pregnancy. Tender, aching breasts and nausea and morning sickness may leave you low.

Week 7 - Tiny fingers and toes form
Baby's tiny fingers and toes are just beginning to form this week, and the arms can even flex at the elbows and wrists. The eyes are becoming more obvious because they've begun to develop pigment in the retina.

Also, the intestines are getting longer and there isn't enough room for them in the baby's abdomen, so they protrude into the umbilical cord until week 12. By now, the beginnings of the buds that will develop into your baby's genitals have appeared, though they've not developed enough to reveal the sex of your baby.

Pregnancy causes many changes in your cervix. By this week you'll have developed a mucous plug, which forms in the opening of the cervical canal and seals off the uterus for protection. You will lose this plug later as your cervix dilates in preparation for labor.

Week 8 - Baby's head has been growing
The tail at the bottom of your baby's spinal cord has shrunk and almost disappeared. However, your baby's head has been growing! It's quite large compared with the rest of the body now and curves onto the chest. By this week, your baby measures about 0.6 to 0.7 inches from head to bottom (derrière) and weighs around 3 grams. The tip of the nose has developed and can be seen in profile, and flaps of skin over the eyes have begun to shape into barely noticeable eyelids too.

Baby's digestive system continues to develop. The anus is forming, and the intestines are growing longer. In addition, internal reproductive features such as testes and ovaries start to form this week.

Your baby may make some first movements this week as muscles develop. If you had an ultrasound about now, those movements might even be visible, though you won't be able to feel them for several more weeks.

Week 9 - Tooth buds form
All your baby's vital organs have formed by now and are starting to work together. As external changes such as the separation of fingers and toes and the disappearance of the tail takes place, internal developments are taking place too. Tooth buds form inside the mouth. And if you're having a boy, his testes will begin producing the male hormone testosterone.

Congenital abnormalities are unlikely to develop after week 10. This also marks the end of the embryonic period - in general, the embryo now has a distinctly human appearance and starting next week your baby will officially be considered a fetus.

Week 10 - Ears move toward their final position
From this week until week 20, your baby will be growing rapidly - increasing in size from about 2 - 8 inches from head to bottom (derrière). To accommodate all this rapid growth, the blood vessels in the placenta are increasing in both size and number to provide the baby with more nutrients.

Facial development continues as the ears move toward their final position on the sides of the head. Although your baby's reproductive organs are developing rapidly, the external genitals of boys and girls appear somewhat similar until the end of week 11 - and can be clearly differentiated only by week 14.

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