Employment lawyers say pregnancy discrimination lawsuits are on the rise in corporate America, particularly among high-level female executives who claim that they are being knocked off the corporate ladder because of maternity issues.

In Chicago, a national marketing manager is suing Merisant Worldwide Inc., the maker of Equal sweetener, claiming that the company demoted her and treated her unfairly because of her pregnancy. Babb v. Merisant, No. 06 C 1383 (N.D. Ill.).