A pacifier is a small, nipple-shaped device made of rubber, plastic, or silicone, designed for infants to suck on. It is used to soothe babies and help them feel calm, mimicking the comfort of breastfeeding. Pacifiers can also help reduce the risk of sudden infant death syndrome (SIDS) during sleep. Parents often introduce pacifiers to their babies in the first few weeks of life. While they can be helpful for soothing, it's important to monitor their use, as prolonged reliance on pacifiers may lead to dental issues or affect speech development. Regular cleaning and replacement are also essential for hygiene.