A baby bouncer is a supportive seat designed for infants that provides a gentle bouncing or rocking motion. It typically features a secure harness, a comfortable seat, and a spring or suspension system that responds to the baby's movements. Baby bouncers offer a safe and stimulating environment for play and relaxation, allowing babies to bounce, sway, or vibrate. They provide a soothing and entertaining experience that can help calm fussy babies or provide a fun activity while the caregiver attends to other tasks.