What I think you are saying is that a woman does not deserve x,y,z (equal pay, equal promotion opportunities, etc. I won’t put the words in your mouth) because if she were to have child(ren), she would need x weeks of maternal leave, whereas a man does not, and therefore yes it is sexual discrimination but it is justified.
Might I remind you: (http://www.eeoc.gov/laws/statutes/titlevii.cfm)
UNLAWFUL EMPLOYMENT PRACTICES
SEC. 2000e-2. [Section 703]
(a) Employer practices
It shall be an unlawful employment practice for an employer -
(1) to fail or refuse to hire or to discharge any individual, or otherwise to discriminate against any individual with respect to his compensation, terms, conditions, or privileges of employment, because of such individual’s race, color, religion, sex, or national origin; or
(2) to limit, segregate, or classify his employees or applicants for employment in any way which would deprive or tend to deprive any individual of employment opportunities or otherwise adversely affect his status as an employee, because of such individual’s race, color, religion, sex, or national origin.
I don’t think anyone would suggest that the world should stop for you, whether you have a baby or break your leg. Breaking your leg is not an appropriate comparison as (I would argue) that having a child is a luxury, whereas an injury is an unforseen accident (I could get into details on whether it was due to negligence, etc., but I won’t to keep this simple). But regardless, if you were to be gone from your job for several weeks, would the IRS stop for you? Or does your employer have some sort of support system that he can rely on so that the deadlines can be met? A pregnancy, whether you argue that it’s a luxury or not, is long enough that arrangements can be made.
What I am saying is, beyond the first x weeks that a woman needs to physically recover from childbirth, the parental leave burden should be allowed to be shared by both mother and father, so that the mother does not de facto bear the entire burden of child rearing. It’s an ugly cycle. There is nothing wrong with a woman who chooses to leave the work force and have children, but it is absolutely not justified that a woman would be passed over in hiring/advancement opportunities simply because she is physically capable of having a child.