Make sure that the toys are suspended at the optimal distance for baby's limited eyesight: approximately 10 inches (25 cm), from your baby's eyes.
Baby will only be able to extend her hand forward, without crossing midline. At this stage, the toy in the middle is for visual stimulation only.
Your baby will be ready to grasp the toys. Make sure that the toys are within her reach, and allow her to bring them to her mouth for further exploration.