We took a long car trip when my son was 9 months old and he was starting to enjoy solid food. We would tie a somewhat stale bagel to a string and then tie it to his car seat. He spent many happy hours gumming it. Not sure what a pediatrician would say, but it sure kept him busy! We also sang to him, which was often rather irritating to the parent not singing, but our son really loved it. Anyone have any clever ideas on amusing babies in the car? We often timed our travels so our kids would sleep driving late in the night.