Teeth
Upper Lateral Incisors Eruption
Typical Timing & Development Window
Starts
30
wk avg
Median
47
wk
Std dev
±4
wk
Flag
55
wk
Visual Timeline & Milestone Benchmarks
Typical range (68% of babies)
Earliest typical start
Median milestone age
Pediatrician check-in flag
What these numbers mean
Starts
~wk 30
The average age babies first begin showing early signs of this skill. Before this, it's simply too early — there's nothing to worry about.
Median
wk 47
The midpoint age: half of babies have reached this milestone by here, half a little later. It's a typical target, not a deadline.
Std dev
±4 wk
How spread out the timing is. About two-thirds of babies achieve it within one standard deviation of the median (the shaded band, wk 43–51). Wide bands mean a normal range of variation.
Flag
wk 55
A gentle check-in point. If your baby hasn't shown this by around here, it can be worth mentioning to your pediatrician — most often it's still perfectly fine, just later.
About this milestone
The upper lateral incisors erupt next to the top front teeth, completing the top front row and supporting early biting skills.
What to try & how to support
- 1. Clean the new lateral incisors thoroughly during the morning and evening brushing sessions.
- 2. Provide textured teething toys for the baby to bite on, which can help relieve gum pressure.
- 3. Monitor pacifier or thumb-sucking habits, ensuring they are not putting excess pressure on the jaw.
What to avoid & gentle reminders
- 1. Avoid sweet, sugary drinks in a bottle, which can coat the new teeth in acid and lead to decay.
- 2. Avoid using hard plastic teething keys that could scratch the sensitive new enamel.