Teething BabyTeething happens when your baby's first set of teeth grow in, a condition called primary teething. Primary teeth are usually lost and replaced later on by permanent teeth. Permanent teeth are the second set of teeth and usually appear around age 6 years  
Primary teething often starts around 6 months of age though it's completely normal for primary teething to start at any time between 3 months and 12 months of age. 
By the time your child has reached 3 years of age, he or she will have all 20 primary teeth.
The lower front teeth usually come in first followed by the upper front teeth about 1 to 2 months after the lower front teeth.

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