It may be because parents transfer their own bacteria to their child’s mouth, helping to boost their immune system.
Researchers led by US healthcare firm Henry Ford Health System asked 128 mothers how they cleaned dummies.
Then they tested the infants’ blood. Lower levels of immunoglobin E antibodies, triggered when children have allergic responses, were found in infants whose parents used their mouths instead of tap water or sterilising.
Source: Independent online