This is taken from Is Abortion Really So Bad? by Dr. Joel Beeke, a pastor, theologian and seminary professor.
What is the justification for legal abortion? Let us examine the arguments used by those who promote abortion to determine on how strong of a foundation this practice is based.
The Fetus Is Not A Human Life, Therefore It May Be Killed
While the fetus will eventually become a human child, this argument says it is not yet so. But science indicates otherwise. First, the words embryo and fetus are Greek and Latin words that simply mean “young one.” When scientists speak of a human embryo or fetus, they are not putting it in the category of another species, but are simply using technical terminology for a stage of development, like the words infant, child, adolescent, and adult. A human fetus is a young human person in the womb. It is natural and correct for mothers to speak of the fetus as “my baby” or for pregnancy books to say “your child.”
Second, from conception, the child has its own genetic code that clearly identifies it as homo sapiens—part of the human race. The child’s DNA also has a distinct code from the mother, showing that he or she is not a part of her body, but a distinct individual living temporarily within her.
Third, ultrasound imaging shows that very early in the process of development the embryo grows into a recognizable human form. The child is not a blob of tissue, but a highly complex, though tiny, baby. At three weeks after conception, a baby’s heart begins beating and pumping blood through the body. At six weeks, a baby’s brain waves are traceable. Virtually all surgical abortions silence a beating heart and a functioning brain. At eight weeks, the arms, hands, legs, and feet are well developed and the child’s fingerprints are starting to form. At eleven weeks after conception, all of the baby’s internal organs are present and functioning. By the end of the first trimester, the baby kicks, spins, somersaults, opens and closes hands, and makes facial expressions.
By any reasonable standard, a human fetus is a young human being. To kill an innocent baby is murder. That’s why the products of abortion are so ugly: severed hands, feet, and heads, wrapped up in bags and discarded. On an intuitive level, we know this. People can shrug off the image of a side of beef or a chicken drumstick, but images of abortion horrify and grieve us because they are images of a dismembered human body. Unborn children are precious human beings and must be protected.