Jello sign

A popular term for the characteristic undulation of the scrotum that occurs with foetal limb movement, a ‘soft’ criterion for determining an infant’s sex by ultrasonography; seen after the 22nd gestational week, the movement is likened to the jiggle of the proprietary brand of instant gelatin

Jello™ sign

Obstetrics A popular term for the characteristic undulation of the scrotum that occurs with fetal limb movement, a 'soft' criterion for determining an infant's sex by ultrasonography; seen after the 22nd gestational wk, the movement is likened to the jiggle of a proprietary brand of instant gelatin.