Parents sucking babies' pacifiers may lead to fewer allergies for kids later in life

Most parents see it happen - a pacifier tumbles out of a crying baby's mouth and hits the floor.

Some parents throw it in the trash; others just give it a rinse in the sink. Some, though, pick up the pacifier, put it in their own mouth then hand it right back to the baby.

A new study suggests the last option may be good for the baby. It's associated with fewer allergies for the child later on. By the time babies were 18 months old, those whose parents sucked their pacifiers were less likely to have asthma and eczema.

Researchers think the health benefit came because parents exposed their babies to bacteria in their saliva, stimulating the baby's immune system.