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Pregnancy & Baby Development: Weeks 6-9

Weeks six to nine of the first trimester mark the transition of your baby from an embryo to a fetus, explains Columbia University Mailman School of Public Health. Major organ systems and recognizable body features begin to take shape. While you wait for his body to mature to the point that he can safely meet you face to face, you can start getting to know him by tracking his week-by-week development during your pregnancy.

Week 6

During week six of pregnancy, the Mayo Clinic states, tiny arm and leg buds start to appear. KidsHealth adds that her eyes and ears start early formation with the development of the optic vesicles, nostrils and the passages of the inner ear. The neural tube along the back closes. KidsHealth also explains that about this time your baby's heart will begin to beat. Her spinal and bone tissue starts growing and her respiratory systems and pancreas begin to take shape. She measures between 0.08 and 0.2 inch -- about the size of a lentil.

Week 7

By week seven of pregnancy, according to Pregnancy.org, your baby's arms develop elbows and begin bending and flexing. Fingers and toes become visible on paddle-like hands and feet. Development of the eye lenses, ears and nostrils continues. Early intestines form in the umbilical cord and teeth begin growing under the gums. "By the end of this week," the Mayo Clinic notes, "your baby might be a little bigger than the top of a pencil eraser."

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Week 8

Eight weeks into pregnancy, you can celebrate one-fifth of the journey to your baby's birthday complete. The basic eye structure is well-advanced, and color emerges in the retinas, reports KidsHealth. The fingers and toes take on a short, web-like appearance and the upper lip and nose form. The intestines move from the umbilical cord to the abdomen, states Pregnancy.org. Cartilage and bone starts growing, giving your baby's form more structure and definition. Her tongue and genital buds appear, although it will be several more weeks before an ultrasound will be able to reveal the gender of your baby, KidsHealth reminds expectant moms. According to Pregnancy.org, at this point your baby is about the size of a kidney bean. She 0.6 inch long and weighs about 0.04 ounce.

Week 9

In pregnancy week nine, development of all your baby's essential organs is well under way, the University of Maryland Medical Center and Pregnancy.org note. KidsHealth explains that the intestines grow longer and formation of the testes or ovaries as well as the anus begins. He begins to develop nipples, hair follicles, eyelids and nose tip during this week. He is still too small for you to feel his movement, but he is already growing muscles and joints to bend and flex. His fingers will grasp onto anything they touch and he already has a fingerprint, reveals Pregnancy.org. He measures about 0.6 to 0.9 inch in length and weighs about 0.07 to 0.1 ounce -- about the size of a grape.

RELATED: What Nutrients Do Pregnant Women Need?

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