Nursing-bottle syndrome, also known as baby-bottle tooth decay or baby-bottle syndrome, is the rapid decay of a child’s primary teeth caused by prolonged contact with infant formula, milk or juice. This often occurs because young children fall asleep with a bottle in their mouth. Baby-bottle mouth can lead to a lifetime of dental difficulties. Preventing nursing bottle mouth is easy: If you give your baby a bottle at nap or bed time, simply fill it with plain water rather than formula, milk, or juice—never let your child fall asleep with a bottle filled with a liquid other than water In addition, check your child for brown spots near the gums because they are a warning sign for tooth decay.