Even with good at home dental care habits you want to always check for any signs of tooth decay. The first signs of cavities in baby teeth are discoloration and minor pitting. Putting Baby to bed with a bottle of milk (or worse, juice) is notorious for causing cavities. Do not leave your infant with a bottle for long periods of time, especially if you notice he/she’s no longer feeding and is just using the bottle for comfort. Just like adults babies need to see their dentist regularly.