Swedish researchers followed 174 babies and their parents for several years. They found toddlers who had their pacifiers sucked on by their parents were less likely to have allergies, asthma and eczema
The reason -- parents exposed the bacteria in their saliva to their babies, stimulating the babies' young immune systems.
Some pedestrians are skeptical. They say the study was small, and the long-term effects of bacteria exposure are not clear.
