9th weeks
- The embryo measures 18 mm (3/4 inch) in length.
- Fetal heart tone (the sound of the heart beat) can be heard using doppler.
- Nipples and hair follicles begin to form.
- Location of the elbows and toes are visible.
- Spontaneous limb movements may be detected by ultrasound.
- All essential organs have at least begun
- The vitelline duct normally closes