Cavities in baby teeth, also known as early childhood caries, are common in young children and can cause significant damage to the primary teeth. Cavities occur when bacteria in the mouth combine with sugar and form acids that break down the enamel of the tooth. Common causes include poor oral hygiene, frequent snacking, and drinking sugary drinks. Symptoms include pain, discoloration, and sensitivity. Treatment typically consists of a dental cleaning and cavity filling. Regular dental visits and proper oral hygiene are important to prevent cavities in baby teeth.