One thing I recently saw in the U.S. are baby bottles with soda labels. Unfortunately I have also seen children with soda in their bottle. The bottle at nap time or bedtime is most dangerous. Fluids may pool around the teeth for hours. The teeth primarily affected by that are the maxillary incisors.
Lower teeth are in general less affected since they are covered by the tongue.
Nursing pattern decay has also been reported with prolonged and unrestricted nighttime breast-feeding. The stagnation of milk about the neck of anterior teeth and the fermentation of the disaccharide lactose, a sugar found in milk, contribute to this caries process. Under usual feeding regimens neither bottle nor breast milk predispose to caries. The typical high risk child will use a nursing bottle far beyond the first birthday. If infants are allowed prolonged access to the bottle its use may become habitual.