Final answer:
Tooth decay in infants and toddlers, also known as baby bottle mouth, is caused by the consumption of sugary liquids, such as formula or juice, from a bottle or sippy cup.
Step-by-step explanation:
Tooth decay in infants and toddlers, also known as baby bottle mouth, is caused by the consumption of sugary liquids, such as formula or juice, from a bottle or sippy cup. These liquids contain fermentable carbohydrates, which are broken down by bacteria in the mouth, leading to the production of organic acids. These acids erode the tooth enamel, causing decay.