Baby Milestone & Teething Age Guide
Enter a baby’s age in months to see the typical developmental milestones and how many baby teeth to expect around that age.
How it works
Approx baby teeth ≈ (age in months − 6), from 0 up to the full set of 20 · Milestones from CDC developmental age bands
Most babies cut their first tooth around 6 months and gain teeth steadily until all 20 primary teeth are in by roughly 2.5–3 years — a handy rule of thumb is “age in months minus six.” Developmental milestones follow their own broad windows, and this guide shows the skills typical for the age you enter. Ranges are wide and every baby is different: reaching a milestone a little early or late is usually normal.
Worked example
At 9 months: about 9 − 6 = 3 baby teeth, and the typical stage is sitting without support, crawling, waving and starting the pincer grasp.
Sources: CDC Developmental Milestones
Frequently asked questions
My baby has no teeth yet — should I worry?
First teeth can arrive anywhere from about 4 to 12 months, and a few babies are later still. The “months minus six” rule is only an average. If there are no teeth by around 18 months, mention it at a check-up.
What if my baby hasn’t hit a milestone for their age?
Milestone windows are wide, so being a bit behind on one skill is often normal. If a child misses several milestones, loses skills, or you have concerns, talk to your pediatrician about a developmental check.
In what order do baby teeth come in?
Usually the two bottom front teeth first, then the top front teeth, followed by the sides and back molars and finally the canines — but order varies from child to child.
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This is a general educational estimate, not medical advice. Every child grows, feeds and responds to medicine differently — for anything about your child’s health, growth, nutrition or medication, follow the guidance of your pediatrician.