Six New York City mothers are suing the makers of a baby gender test that touted its product as "infallibly accurate," saying the test results they received were wrong.

In papers filed in Manhattan Supreme Court, the women claimed they received incorrect results from the $275 Baby Gender Mentor test by Acu-Gen Biolab Inc., of Lowell, Mass.

The suit says the test makers advertised its product as the "gold standard for prenatal gender detection."

Lawyer Barry Gainey says the lawsuit charges the product's makers and marketers with negligence and fraud, and seeks unspecified damages.

A call for comment placed Monday night to officials at Acu-Gen Biolab Inc. was not immediately returned.