We never ever let James sleep with a bottle. I wanted to do that sometimes, because it's so hard to keep little kids asleep in their cribs, but our pediatrician warned us that it was the number one cause of cavities in toddlers. So we didn't do it. We cut his juice with water and tried to limit it. But nonetheless, the poor little guy has a bunch of cavities already. We took him to a hardcore dentist who assures us everything will be fixed and he will have no more cavities in the future. We'll see!