During breastfeeding, the mother's nipple flattens naturally when it is in your baby's mouth Vital Baby NURTURE ™ nipples are designed to simulate breastfeeding, which helps reduce lactation confusion and can make the transition between feeding and bottle feeding. This is the elastic area around the nursing nipple that allows the nipple to stretch and bend like a mother's breast, making it more comfortable and a natural sensation of breastfeeding the baby. Healthcare professionals agree that the most common cause of colic in young children is the result of problems with digestion or nutrition, which are directly related to the ingestion of air when feeding The baby can swallow air in two main ways during bottle feeding; air enters the bottle and mixes with milk and the baby takes air while feeding from the nipple.