Bulb sucker, also known as a bulb syringe or nasal aspirator, is a small, handheld device used to clear mucus and fluids from a baby's nose or mouth. It's typically made of rubber or silicone and features a bulb that can be squeezed to create suction, drawing out the congestion. These devices are commonly used to help infants breathe easier, especially when they are congested due to colds or other illnesses.