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Infant development experts say that teething usually starts when your baby is around four months old, and continues until he or she is about two years old, at which time you get a reprieve until about five years old when the baby teeth start being replaced by grown-up teeth.
Tea is correct in that they start teething the day they are born, and with puppy teeth in full bloom at 4-6 weeks (and a mother that is screaming for them to stop) The conclusion of teething pretty well matches up with the onset of puberty 5-7 months.