They are.It comes down to whether the rights of a mother are more important than the rights of an unborn child.
As I touched on earlier in the thread, there's always a risk of getting in a collision when we drive, but this doesn't mean that we consent to being run into.If a child has sentience, and a great deal of it, it should be illegal. The fetus is not only the mothers, there is the paternal DNA in it as well. There is always a risk with sex, and that risk is conception.
After birth, the needs of the child aren't in conflict with the rights of the woman.You can extend your statement and say that the rights of a child can be infringing on the rights of a mother to live her life, even after it's born. Does that mean a mother has the right to kill an infant? How do you differentiate an infant from a 34 week old fetus? Physiological dependence? Dependence remains for many years, and one can argue that the psychological to physiological neural growth throughout childhood is important as well..
A parent has obligations, but they can be satisfied by others (provided they consent). Comparing this to abortion is like comparing our obligation to pay our bills with debtor's prison (which is something we as a society consider abhorrent today).