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Babies love pacies, but they often end up anywhere but their little mouths. Like the floor, the lawn, the dog.

After you clean the fallen pacie consider giving it a final rinse right in your mouth.

A new study in the journal Pediatrics says cleaning the pacie in your own mouth can cut your child’s risk of developing allergies, including asthma and eczema.

The researchers suggest the transfer of microbes from your mouth to your baby's, via the pacifier, initiates this protective effect. It makes the microbes in the baby’s digestive tract more complex and helps the baby handle the antigens that trigger allergies.

Interestingly, babies born vaginally also get some protective benefits, since they’re exposed to complex microbes during delivery.

Of course, if you’re sick, just rinse it and give the pacie right back to its user. Don’t risk exposing the child to infectious diseases.