Baby onesies are one-piece garments designed for infants and young children. They typically feature a simple design with short sleeves, a round neckline, and snaps at the crotch. Onesies are designed to cover the baby's torso and provide a convenient diaper cover as well. They are typically made from soft, breathable fabrics such as cotton or a cotton-blend, and come in a wide range of colors and patterns. Onesies are a staple item for babies because they are comfortable, practical, and easy to put on and take off. They can be worn alone in warmer weather or layered under clothing for added warmth in cooler temperatures. Onesies are available in various sizes to fit infants of different ages and weights.