Last June 3, my daughter announced that she would no longer drink milk from the bottle. It came as a surprise since we were still a few months shy from her 6th birthday (my target date) and more than a year away from her 7th (her negotiated target).
She'd lost her first tooth that morning and had apparently tried to figure out why. She decided that it was the 'dede' (our term for the bottle). And since she didn't want to lose all her teeth, she was going to stop.