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The nipple of the feeding bottle is made of special material, it changes color according to the milk's temperature to indicate the parents if the milk is cool enough to drink. The nipple also contains a special ring made from heat-sensitive material which expands quickly to block the nipple hole when the milk is too hot. This prevents the infants from scalding. When the milk’s temperature fall to 38 Celsius (body temperature of a woman in lactation), the ring shrinks to let the milk pass through. This is an absolute safe feeding bottle even when the parents are not with the baby and the baby himself grab the bottle to drink.
Bergische Universität Wuppertal