between 4 and 7 months old.
The vast majority of babies sprout their first tooth when they're between 4 and 7 months old. An early developer may get his first white cap as early as 3 months, while a late bloomer may have to wait until he's a year old or more. By age 3, your child should have a full set of 20 baby teeth, and they shouldn't start to fall out until his permanent teeth are ready to start coming in – around age 6. Teething usually begins around 6 months of age. But it is normal for teething to start at any time between 3 months and 12 months of age. By the time your child is about 3 years old, he or she will have all 20 primary teeth. The lower front teeth usually come in first. Upper front teeth usually come in 1 to 2 months after the lower front teeth. The average baby begins to show the first signs of teething between 6 and 10 months of age, but when do babies get all their teeth? On average, all of a child's teeth have come in by 30 months of age. However, there is variability in the timing and sequence of tooth eruption based on a number of factors, including gender and ethnicity. Babies usually get their teeth in this order and at the following ages: 1  Lower center incisors: 5 to 7 months. 2  Upper center incisors: 6 to 8 months. 3  Upper lateral incisors: 9 to 11 months. 4  Lower central incisors: 10 to 12 months. 5  First molars: 12 to 16 months. 6  Canines: 16 to 20 months. 7  Second molars: 20 to 30 months. As soon as your baby's first tooth comes through, you'll need to get in the habit of tooth cleaning. Six months (typical: five to seven months) (NHS 2014, NICE 2014). Your baby's first teeth emerge, usually on the bottom in the middle (lower central incisors). These two teeth arrive at about the same time. Teething begins. Your baby's gums may be swollen and red where his new teeth are cutting through. It may be a bit painful for him, and he may dribble quite a bit (NHS 2014) . You'll probably need to do a lot of comforting. 1 Sometime between 3 to 12-months old, your child's primary, or baby teeth will begin to protrude (or erupt) through the gum. 2  Each tooth has a visible surface above the gum called a crown. 3  You can't see them, but they also have one, or more, roots extending into the gum. The First Years: Teething & Baby Teeth. 1  The following chart shows when your child's primary teeth (also called baby teeth or deciduous teeth) should erupt and shed. Eruption times vary from child to child. As seen from the chart, the first teeth begin to break through the gums at about 6 months of age. Usually, the first two teeth to erupt are the two bottom central incisors (the two bottom front teeth). Next, the top four front teeth emerge. The complete set of primary teeth is in the mouth from the age of 2 ½ to 3 years of age to 6 to 7 years of age. Other primary tooth eruption facts: 1  A general rule of thumb is that for every 6 months of life, approximately 4 teeth will erupt. While you were pregnant, your baby developed tooth buds, the foundation for baby teeth (also called milk teeth). Very rarely, a baby is born with a tooth or two, or grows a tooth in the first few weeks of life. But the vast majority of babies sprout their first tooth sometime between 4 and 7 months old. (Premature babies may be a few months behind in getting their teeth.). Also, if your child has all the signs of teething – heavy drooling, swollen gums – but also seems to be having unusual pain (crying inconsolably is a big clue), call his doctor. Teething shouldn't be an excruciating ordeal for a baby. Most babies get their first tooth at around 6 months, but your child's chompers may appear as early as 3 months or as late as 14, depending on such factors as when Mom and Dad started sprouting teeth and whether or not your baby was a preemie (preemies tend to teethe on the late side).  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. 
http://www.babycenter.com/0_teething-your-babys-first-teeth_11243.bc http://www.webmd.com/parenting/baby/tc/teething-topic-overview http://kids.emedtv.com/teething/when-do-babies-get-all-their-teeth.html http://www.babycentre.co.uk/a1050142/your-childs-teething-timeline http://www.orajel.com/en/Resource-Center/Teething-Relief/When-Do-Babies-Start-Teething http://www.webmd.com/oral-health/guide/dental-health-your-childs-teeth http://www.babycenter.com/0_baby-milestones-teething_6574.bc http://www.parenting.com/article/guide-teething-symptoms http://www.parenttime.com/babyarticles/teethingschedule.html
what age do babies get teeth