8 weeks
- The embryo measures 13 mm (1/2 inch) in length.
- lungs begin to form
- The brain continues to develop.
- The embryo measures 18 mm (3/4 inch) in length.
- the sound of the heart beat can be heard using doppler.
- nipples and hair follices begin to form
- Spontaneous limb movements may be detected by ultrasound
- Embryo measures 30–80 mm (1.2–3.2 inches) in length
- Facial features continue to develop.
- The external features of the ear begin to take their final shape
- The head comprises nearly half of the fetus' size.
- The eyelids close and will not reopen until about the 28th week
- Genitals appear well differentiated
- The fetus reaches a length of about 15 cm
- More muscle tissue and bones have developed, and the bones become harder
- The fetus makes active movements
- Sucking motions are made with the mouth
- the liver and pacrease produce secretions.
- main development of external genitalia is finished
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