Teething Timeline Calculator
Estimate when baby teeth will appear based on age and common eruption patterns. Enter values for instant results with step-by-step formulas.
Reviewed by Rahul Singh, Health & Wellness Specialist
Formula
Expected teeth at age = Sum of teeth with average eruption month <= current age
The calculator uses American Dental Association eruption data to estimate which teeth should have appeared by a given age. Each of the 20 primary teeth has an average eruption month and a normal range. The timeline can be adjusted for early or late teething patterns based on genetic predisposition.
Worked Examples
Example 1: 6-Month-Old Starting to Teeth
Problem:A 6-month-old baby has no teeth yet but shows signs of teething. Using average timing, when should the first teeth appear and what is the expected timeline?
Solution:At 6 months with average timing:\nExpected first teeth: Lower Central Incisors (avg 6 months, range 4-10 months)\nTeething is imminent or may have just begun beneath the gums.\nExpected teeth by 12 months: ~6 teeth (central + lateral incisors)\nExpected teeth by 18 months: ~12 teeth (+ first molars and canines)\nComplete set of 20 teeth by approximately 26-33 months.
Result:Expected: 2 teeth | Current: 0 | Next: Lower Central Incisors (imminent) | Status: May begin soon
Example 2: 14-Month-Old Tooth Count Check
Problem:A 14-month-old has 6 teeth. Is this normal? When should the next teeth appear?
Solution:At 14 months, the expected tooth count is approximately 6-8 teeth:\n- 2 Lower Central Incisors (6 months)\n- 2 Upper Central Incisors (8 months)\n- 2 Upper Lateral Incisors (10 months)\n- 2 Lower Lateral Incisors (10 months) = 8 expected\nHaving 6 teeth is within normal range.\nNext expected: First Molars around 14 months (range 11-18 months).
Result:Expected: 8 teeth | Current: 6 | Status: On track | Next: First Molars (due now)
Frequently Asked Questions
When do babies typically start teething?
Most babies begin teething between 4 and 7 months of age, with the lower central incisors usually being the first teeth to appear around 6 months. However, there is a wide range of normal variation in teething onset. Some babies are born with natal teeth already present (approximately 1 in 2,000 births), while others may not get their first tooth until 12 to 14 months of age. The timing of tooth eruption is largely determined by genetics, so if parents teethed early or late, their children often follow a similar pattern. Late teething by itself is not typically a cause for concern, but if no teeth have appeared by 18 months, it is worth consulting a pediatric dentist to rule out rare conditions.
What are common signs and symptoms of teething?
The most reliable signs of teething include increased drooling, swollen or red gums at the eruption site, and a desire to chew or bite on hard objects. Many babies become fussy or irritable, may have disrupted sleep patterns, and may show decreased appetite. Some babies pull at their ears or rub their cheeks near the eruption site. Mild temperature elevation (below 100.4 degrees Fahrenheit or 38 degrees Celsius) may occur but true fever is not caused by teething. Similarly, while some parents report mild diarrhea or rash, research does not consistently support these as teething symptoms. If a baby has a high fever, significant diarrhea, vomiting, or appears truly ill, these symptoms should be attributed to illness rather than teething and warrant medical evaluation.
What are safe ways to relieve teething discomfort?
Several evidence-based approaches can help soothe teething pain safely. Chilled (not frozen) teething rings or clean wet washcloths provide counter-pressure that relieves gum discomfort. Gently massaging the gums with a clean finger can provide temporary relief. Age-appropriate doses of infant acetaminophen or ibuprofen (for babies over 6 months) can address significant pain, but should be used sparingly and only on pediatrician recommendation. The FDA and AAP specifically warn against using benzocaine-containing teething gels (such as Orajel) due to the risk of methemoglobinemia, a potentially fatal condition. Homeopathic teething tablets have also been recalled due to inconsistent belladonna levels. Amber teething necklaces pose choking and strangulation risks and have no proven efficacy.
Does breastfeeding affect the teething timeline?
Research indicates that breastfeeding itself does not significantly alter the timing of tooth eruption. The teething timeline is primarily determined by genetic factors, with some influence from nutritional status, birth weight, and overall health. However, breastfeeding does impact dental health in other ways. Breast milk contains antibodies and beneficial factors that may protect against early childhood caries, though prolonged nighttime breastfeeding after teeth erupt can contribute to tooth decay similar to bottle use. The World Health Organization recommends continuing breastfeeding alongside complementary foods for up to two years or beyond. Parents should begin cleaning erupted teeth twice daily regardless of feeding method, and should introduce a cup rather than a bottle for supplemental liquids after the first birthday.
References
Reviewed by Rahul Singh, Health & Wellness Specialist · Editorial policy