Early childhood caries is a serious dental disease affecting young children that results from improper feeding practices like putting children to bed with bottles containing sugary liquids. It can cause pain, cavities, and other issues. Parents can prevent it by cleaning their child's gums after feeding, not allowing bottles in bed or prolonged daytime use, brushing teeth once they emerge, visiting the dentist regularly, and avoiding sugary foods and drinks. Signs of early childhood caries include white or dark spots on teeth.