What can I expect to happen when my 6-month-old is teething?

It is a milestone. Many parents maintain that their teething babies do experience discomfort (though some babies get through the process with no problems at all). The symptoms most likely to occur are:drooling, gum swelling and sensitivity, irritability and fussiness, biting behavior, refusing food and finally, sleep problems.
Drool, pain. Teeth come in almost constantly from 6 months to 2 years of age. While getting teeth, your baby may drool and chew a lot.