The SneakPeek gender prediction test is based entirely on science. SneakPeek is a DNA-based test that looks for male chromosomes in the fetal DNA found in mum’s blood, the same technology as the Non-Invasive Prenatal Test (NIPT). If male chromosomes are present, the baby is a boy. If none are found, it’s a baby girl. The gender predictor test is 99.9% accurate at 7 weeks into a woman’s pregnancy.