Perinatologists at the University of Belfast (U.K.) recently reported studying the movements of 39 fetuses by ultrasound during the 4th month of gestation (l6th to 20th weeks) spending 3 hours watching each infant. Their major finding: Female fetuses open and close their mouths much more frequently than male fetuses. Hepper, P.G., et. al. LANCET 150:1820 Dec. 20/27, 1997