Okay, you know what infant stimulation is. Very little extra time is necessary. You can do these activities with one or more babies at a time, if you have twins or triplets. These suggestions are natural things you can do with any baby. Use your ingenuity and special knowledge of your baby to devise other ways of stimulation.
Suggestions are in sensory categories.
The ideas come from infant stimulation teachers, physicians, physical therapists, and parents who have gone this road before you. You must be careful not to over-stimulate such a baby. Do the activities when your baby is in an alert, calm and receptive mood. Take your cues from your children. Generally, a baby's facial expression will change as his stimulation tolerance is reached.