Expanding on the critically acclaimed In the Womb and In the Womb: Animals, National Geographic explores the extraordinary, never-before-seen world of twins, triplets and quadruplets as they develop in utero. Utilizing groundbreaking technology and amazing 4-D ultrasound images, watch quadruplets as they develop in utero and engage in their first interactions with each other. Can multiples hold hands? When one pushes, does the other push back? Does prenatal game-playing carry over into early childhood?