Muscle Development: 3 months old babies can lie down on this colorful mat and on the piano keys as well as they touch the hanging toys which will help your child to strong their muscle arms, legs, neck, and dorsal Hand-eye Coordination: 6 months old babies can sit and play the hanging ring bell, which will train grasping and capability and flexibility of baby's small hands. Sensory Development: When babies on the piano keys; it will send out the sound of different music and thus stimulate baby’s sense of hearing. Object Recognition: Activity Playmat will help your little one to recognize the different colors, various objects, and shapes. 0-6 months Lying down and Play - Baby can exercise limbs by constantly and scratching. 6-9 months Crawling and playing - Strengthen your baby's neck, shoulder, and leg. 9-18 months Sit and Play - Promote the development of the baby’s fine hand movements.