5th week - Lens pits and optic cups are formed. 38 days - Every muscle block is present. 40 days - Brain waves can be measured. 6th week - Oral and nasal cavities form. 7th week - upper limbs now bent at arms.
Eyelids begin to form.
Mouth and tongue are visible. Fetal Period 8th week - Major organ development begins. Eyelids meet and close. Fingers and feet are visible. 9th week - The baby's eyes have retina and lenses.