Listings cover newborns through toddler stages. Common age ranges shown include “0–12 months”, “3–12 months”, “0–36 months”, “Newborn and up”, “0–18 months”, and “3 months and up”.
Common materials listed are rubber, silicone, plastic, and polyester.
Common sensory features include multiple textured surfaces for touch, audible elements like rattles or internal squeakers, and visual or musical stimulation such as lights and melodies; many also use high-contrast colors and easy-to-grip designs.
Many designs emphasize easy-to-grip shapes and lightweight or flexible construction; others use curved handles, looped or cross-bar grips, and extended parts to help reach molars for chewing.