Baby bottle tooth decay is a pattern of rapid decay associated with prolonged nursing. It happens when a child goes to sleep while breast-feeding and/or bottle-feeding. During sleep, the flow of saliva is reduced and the natural self-cleansing action of the mouth is diminished. Avoid nursing children to sleep or putting anything other than water in their bedtime bottle. Encourage your child to drink from a cup as they approach their first birthday. He/she should be weaned from the bottle at 12-14 months of age.