When people ask “when do molars come in,” they usually mean baby molars, adult molars, or wisdom teeth—each has its own timeline.

When Do Molars Come In?

Quick Scoop Molars are the big, flat teeth in the back that do most of the grinding and chewing. They don’t all arrive at once; they come in stages from toddler years through late teens or early 20s.

Baby Molars (Primary Molars)

These are the back teeth in the baby set that help toddlers chew more solid foods.

  • First baby molars:
    • Upper: about 13–19 months.
* Lower: about 14–18 months.
  • Second baby molars:
    • Lower: about 23–31 months.
* Upper: about 25–33 months.
  • Most kids have a full set of 20 baby teeth, including molars, by around age 3.

A common real‑life pattern: a child might get fussy and drooly around 18–24 months, then you suddenly spot those back molars peeking through.

Permanent Molars (Adult Back Teeth)

These arrive in waves and stay for life (unless removed or lost).

  • First permanent molars (“6‑year molars”):
    • Usually come in around ages 6–7, behind the baby molars.
* Some kids get them a little earlier or later (roughly 5–7 years).
  • Second permanent molars (“12‑year molars”):
    • Typically erupt around ages 11–13.
  • These molars do not replace baby teeth; they erupt behind them and become part of the permanent chewing surface.

Parents on forums often describe these as a “second round of teething,” especially the 6‑year molars, with complaints of sore jaws and trouble cleaning way in the back.

Wisdom Teeth (Third Molars)

Wisdom teeth are the last molars and often the most talked about in teen and young‑adult forums.

  • Typically develop under the gums around ages 14–16.
  • Often erupt between ages 17–21, though “late teens to early 20s” is the usual window.
  • Not everyone gets all four wisdom teeth, and some people never develop any at all.

Trending discussions in recent years focus on whether to remove wisdom teeth early, with many dentists recommending removal if they are impacted, crowding other teeth, or hard to keep clean.

How Much Variation Is Normal?

Teeth don’t follow the calendar exactly, and that shows up in countless parent threads and Q&As.

  • Being a few months early or late for baby molars is usually normal.
  • 6‑year molars can show up as early as 4–5 or as late as 7–8.
  • Genetics, nutrition, and overall health can slightly shift timing.

Many forum parents share stories like:
“My older child’s 6‑year molars popped at 5½, but my younger one didn’t get them until almost 8—dentist said both were totally fine.”

That said, if a child seems very delayed compared with typical ranges, or has pain and swelling that seems extreme, most pediatric and family dentists recommend an in‑person check.

Quick Age Guide (Molars by Stage)

[9][1] [9][1] [7][3][5][1] [3][5][1] [5][1]
Molar Type Usual Age Range Notes
First baby molars 13–19 months (upper), 14–18 months (lower) Help toddlers chew more solid foods.
Second baby molars 23–33 months Last baby teeth to erupt; most kids done by ~3.
First permanent molars About 6–7 years “6‑year molars”; may appear 5–7 in many kids.
Second permanent molars About 11–13 years Often called “12‑year molars.”
Wisdom teeth (third molars) Usually 17–21 years Not everyone develops them; often evaluated for removal.

Forum‑Style FAQs and “Latest News” Angle

Online parent and health forums in the mid‑2020s keep circling a few recurring questions about “when do molars come in,” especially as people share real‑time teething photos and X‑rays.

  1. “My toddler is 2 and waking up crying—could it be molars?”
    • Yes, second baby molars often come in between about 2 and 3 years, and night‑time fussiness, chewing, and drooling are common.
  1. “Do 4‑year‑olds get new molars?”
    • They don’t usually get a new type of tooth then, but some kids’ 6‑year molars can start as early as about 4–5, which can confuse parents.
  1. “Is it normal my 7‑year‑old still doesn’t have 6‑year molars?”
    • Many dentists say that up to around age 7 or so can still be within normal limits, but a quick dental exam is the safest way to be sure.
  1. “Wisdom tooth removal seems so common—are they really necessary?”
    • Current guidance is individualized: if wisdom teeth are healthy, fully erupted, and easy to clean, they may be left alone; otherwise, removal is often recommended to prevent future issues.

When To Call a Dentist

Consider a professional check if you notice:

  • No baby molars at all well past age 3, or no first permanent molars by around 8.
  • Severe or one‑sided swelling, high fever, or your child seems very unwell.
  • Broken or decayed molars, or difficulty chewing on one side.

A dentist or pediatric dentist can take a quick look (and sometimes an X‑ray) to see whether molars are present under the gums and whether eruption is on track.

Bottom note: Information gathered from public forums or data available on the internet and portrayed here.