Have you ever watched a child feed their doll with a fake baby bottle and wondered, “ Where does the milk go ?” It disappears like magic, leaving both kids and curious adults amazed. While it might look like a simple toy trick, there’s actually a clever mechanism behind this illusion that involves physics, engineering, and design artistry. In this blog, we’ll explore the science and creativity hidden inside toy baby bottles , from how they work to why they continue to be favorites in pretend play. ✨ The Illusion of Disappearing Milk: How Does It Really Work? At first glance, it seems like actual liquid milk vanishes as the bottle tips. But in truth, most fake baby bottles use a sealed inner compartment containing a viscous fluid , typically white oil-based or water-glycerin mixtures , that creates the illusion of movement. According to Scientific American , illusions in toys are often rooted in visual perception and clever material design. In this case, the "milk" sli...