Lokisdottir said:
Having a heartbeat doesn't equal having consciousness. I'm no scientist, and I'm also too tired to go on a hunt for sources, so I'll leave this debate (when is a fetus capable of feeling pain) for later.
I did some research.
Source:
The Least of These by Curt Young
If you have time, please read it all, if not read the sixth week and the third month.
By the third week after conception: embryo developing rapidly, body systems start developing, the first of which is the Central Nervous System. By twenty days after conception the foundation for the brain, spinal cord, and the entire nervous system. quote: "Throughout its growth the brain influences that of other organs"
The fourth week: embryo is a size of a penny. The internal skeleton begins to form, along with the mouth and body cavity, small buds begin to form which will form the arms and legs.
The fifth week: eyes, nostrils, lips, and tongue are visible, can see the cerebral cortex and the pituitary gland starts to form.
The sixth week: Major internal organs are present, toes and fingers starting to develop. You can see the brain, and
brain activity can me measured
The seventh week: Bone replaces cartilege, brain growth and muscle development.
The third month: fetus begins breathing in and out amniotic fluid which strengthens his or her lungs, fingernails and toenails begin to form, and skin is sensitive to touch quote: "
There is not question that this individual can suffer and experience acute pain"
Fourth month: fetus is about six inches long, and begins to suck his or her tongue, the mother can feel the fetus moving (although movement starts earlier)
5th/6th month: If born during the sixth month the fetus/baby has a good chance of surviving. The eyes have opened in utero, causing awareness to light, also has sensitivity to taste as the tongue is now covered with taste buds. Loud noises startle him or her.
The last three months is when "baby fat" accumalates, and the placenta starts to deteriote, so the baby will soon be ready to be born.