3 6 months to help baby practice tummy time allow baby to explore the colorful rock ball toy while lying on his tummy let him play with the rings gaze at the mirror and push the ball with his hands while developing her shoulder and neck muscles 6 months encourage your baby to explore the rock ball and change its shape show her how the ball turns into a tambourine and changes back again point out the different qualities of the baby toy in each position this quality of change fascina