A pacifier, also known as a soother or teether, is a small, nipple-shaped device made of rubber, plastic, or silicone. It is designed for infants and young children to suck on, providing comfort and soothing them when they are upset or fussy. Pacifiers can help satisfy a baby's natural sucking reflex, which is important for their development. Parents often use pacifiers to help babies fall asleep or calm down during stressful situations. While pacifiers can be beneficial, it's important to monitor their use, as excessive reliance may lead to dental issues or affect breastfeeding. Regular cleaning and replacement are also essential for hygiene.