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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.
When Do Babies Get Teeth. It is completely normal for your baby to get her first tooth at 18 months. And there are rare cases when an infant is born with teeth. For most children, however, that first tooth will appear around six months.1  1.2  2.3  3. 4  4.hen Do Babies Get Teeth. It is completely normal for your baby to get her first tooth at 18 months. And there are rare cases when an infant is born with teeth. For most children, however, that first tooth will appear around six months. 1  1. 2  2. 3  3.