What Age Is a Toddler? Ages, Stages and Milestones
Updated September 2025 · 5 min read
A toddler is generally a child between about 1 and 3 years old — roughly 12 to 36 months. The name comes from “toddling,” the unsteady early walking that marks the start of the stage. Before this children are babies or infants; after around age 3 they’re usually called preschoolers.
- Toddlerhood spans roughly age 1 to 3 (12–36 months).
- The word comes from “toddling” — those first wobbly steps.
- Under 1 = baby/infant; around 3+ = preschooler.
- Ages are guides — children develop at their own pace.
The simple answer
A toddler is a child roughly between 1 and 3 years old — about 12 to 36 months. The word comes from “toddling,” the wobbly, wide-legged walk of a child just finding their feet, which is what tends to mark the beginning of the stage.
How the age labels fit together
- Newborn: the first few weeks.
- Baby / infant: birth to around 12 months.
- Toddler: around 1 to 3 years.
- Preschooler: around 3 to 5 years.
These bands overlap a little and vary between sources — they’re a rough map, not strict cut-offs.
What toddlers are working on
It’s a stage of huge change. Broadly, toddlers are developing:
- Movement — from first steps to walking, climbing, running and kicking a ball.
- Language — from first words to short sentences and a rapidly growing vocabulary.
- Independence — “me do it!”, big feelings, and the famous tantrums as they learn to manage frustration.
- Play — pretend play, sorting and stacking, and the beginnings of playing alongside other children.
Every child is different
Milestones give a general idea of what’s typical, but the range of “normal” is wide — some toddlers walk at 10 months, others at 15, and both are fine. If you ever have concerns about your child’s development, your health visitor or paediatrician is the right person to ask.
Frequently asked questions
What age range is a toddler?
Roughly 1 to 3 years old (about 12 to 36 months). Under 1 a child is usually called a baby or infant, and from around age 3 a preschooler.
Why are they called toddlers?
The word comes from u201ctoddlingu201d u2014 the unsteady, wide-legged early walking of a child who has just learned to walk.
Is a 3-year-old a toddler or a preschooler?
Around age 3 is the overlap u2014 many sources count 3-year-olds as older toddlers, while others call them preschoolers. Either is fine.
Sources
Guidance in this article reflects widely published parenting and paediatric advice from bodies such as the American Academy of Pediatrics (AAP) and the UK’s NHS. It is general information, not medical or dietary advice — always follow the guidance of your own paediatrician, health visitor or a registered dietitian.