Your baby is growing -- he's now a tiny bundle about the size of a lima bean. He is well-cushioned in his uterine home, afloat in the clear "waters" of the ever-growing amniotic sac. Here, he can drift around freely, while still remaining attached to the placenta by the bungee-like umbilical cord. The placenta is busy processing nutrients from your bloodstream to nourish the embryo, while also disposing of waste produced by him.
At this point, the embryo's entire body is beginning to uncurl a bit, but its head is still very large in proportion to the rest of it. This will also be true after birth: a newborn's head makes up about a quarter of its length, while an adult's is only an eighth.
The esophagus, which brings food to the stomach, forms this week, and on either side of it, two buds that are the beginning of lungs. Imagine: it will be eight months until those lungs gulp their first breath of air.
All content on this Web site, including medical opinion and any other health-related information, is for informational purposes only and should not be considered to be a specific diagnosis or treatment plan for any individual situation. Use of this site and the information contained herein does not create a doctor-patient relationship. Always seek the direct advice of your own doctor in connection with any questions or issues you may have regarding your own health or the health of others.