A teether is a toy designed for infants and toddlers to chew on during the teething process. Teething occurs when a baby's teeth begin to emerge through the gums, which can cause discomfort and irritability. Teethers are often made from safe materials like silicone, rubber, or wood, and they come in various shapes and sizes to appeal to young children. Parents often choose teethers that are easy for little hands to grasp and can be chilled in the refrigerator for added soothing relief. Some teethers are also designed to be multi-functional, incorporating features like rattles or textures to engage a child's senses. Popular brands include Sophie the Giraffe and Nuby.