At week six, your baby's brain is divided into five cavities. The ears of
your infant are forming while the sinus cavity lengthens as it grows. At
36 days, your baby is beginning to form his or her internal organs such as the
stomach, liver and esophagus. The embryo still appears curved at this
stage.
During week six, the jaw is developing, the face is forming.
Color is appearing on the eyes while the eye muscles are growing. The yolk
sac begins to break down as the liver takes over making new blood cells for the
fetus. Chambers are forming in the heart as the embryo begins resembling
something more or less human. Your baby is approximately 8 mm at this
stage. On day 42, your baby is now forming a sense of smell!
At this stage of your pregnancy, you may feel like sleeping every chance you
get. You are fatigued, your breasts may be sore and you might be nauseas.
It is possible you are urinating more frequently as well.