A babies first primary tooth usually begins to come in around 5 to 6 months of age.
However sometimes a babies primary tooth can start to come in as early as the day of birth or it can be as late as the babies first birthday.
When your baby does begin teething the symptoms of teething can last for up to a full year.
When your baby is in the teething stage he or she will drool a lot so be sure to wipe the babies face off often so that they don't get a rash on their face from the saliva.
A baby should be fully done teething within a year but it can depend on the baby.