The fact is that an early developing fetus has hardly any of the characteristics of a human. In fact fetal development is a process that displays thousands of unused evolutionary traits. When a fetus is nearly developed, then there should be controversy, but a month old fetus is resembles a pig more than a human (both physically and mentally). I can understand the concern over aborting fetuses; I have extremely religious family members. However, if you are a rational and same person, and understand the stages of fetal development (a blastula of 8 cells forming a human of millions of cells), abortion when done correctly is no different than killing a pig, cow, chicken, turkey, ant, or spider.
I have also heard the "fetuses are potential people" argument. If it were evil to abort any potential humans, then men would have some serious psychiatric problems. Every sperm cell is a potential human: each one would produce a unique individual, but men kill millions of sperm ever month (or week....day.....or hourly if you have the balls). In this sense the argument fails.
It all comes down to tradition and deeply held religious beliefs. If you don't feel comfortable with aborting your baby, then don't.
There is a ton of philosophy involved in abortion. no person with knowledge of biology would say that eight cells are intelligent. But then when does a clump of cells become intelligent? Logically it is some time between blastula and birth.......