Work out teething timeline instantly with clear inputs, formula shown and shareable results.
The common paediatric rule of thumb is teeth equals age in months minus six, capped at the full set of twenty primary teeth by around thirty months. Eruption timing varies widely, so the rule is a guide for reassurance rather than a schedule, and the count of teeth still to come is the more useful planning figure.
Expected teeth
expected teeth = age in months - 6, floored at 0 and capped at 20
Remaining
remaining = 20 - teeth already through
expected teeth = age in months - 6, floored at 0 and capped at 20. The common paediatric rule of thumb is teeth equals age in months minus six, capped at the full set of twenty primary teeth by around thirty months.
Eruption timing varies widely, so the rule is a guide for reassurance rather than a schedule, and the count of teeth still to come is the more useful planning figure.
Enter baby's age, teeth already through. The defaults shown are a realistic worked example — swap in your own figures to get a result you can use.