My 10-1/2 month old daughter is doing the same thing. According to my baby books, around 9-12 months babies may start to refuse their bottles b/c they prefer to explore, play, and climb on things. Here's what we do--leave the bottle on the floor and when my daughter wants it, she crawls over to it and takes it. She's become quite the cluster feeder now. She'll sip it for about 15 seconds, drop it and continue playing, then return to it again later. Eventually, she finishes it, but usually not in 1 sitting. It's just their way of asserting their independence. Now is the perfect time to start transitioning to a sippy cup anyways--less messy too. Good luck!