Baby bottles are containers designed for feeding infants and young children. They typically consist of a bottle body, a nipple, and a cap. The bottle can hold liquid, such as formula or breast milk, while the nipple allows the baby to suck and drink. Baby bottles come in various sizes and materials, including plastic and glass, to suit different needs. Parents often choose baby bottles based on factors like ease of cleaning, flow rate of the nipple, and whether they are BPA-free. Some bottles are designed to mimic the shape of a mother's breast, making it easier for babies to transition between breastfeeding and bottle-feeding.