When you welcome a baby into your life, the perception of time shifts dramatically. Weeks can feel like months as you navigate through feeding schedules and sleepless nights. The milestones that once seemed trivial now become major topics of conversation among friends and future playdate companions (“Can you believe he just turned nine months?”). Eventually, you may find yourself pondering when your little one officially leaves the “baby” stage behind. So, when does a baby become a toddler? Is a four-year-old still considered a toddler?
Let’s dive into the details of toddlerhood and what to expect as your child grows.
So, at what age is a toddler?
The Centers for Disease Control and Prevention (CDC) defines toddlerhood as the period between 12 and 36 months, or from one to three years old. This means that once your baby celebrates their first birthday, they are officially no longer a baby (take a moment to process that, we know it can be tough). While you might still find yourself counting months initially, most parents begin to refer to their child’s age in years after they leave toddlerhood. So, if they are three or four years old, that’s how you’ll describe them (and we completely understand if you still want to celebrate half-birthdays!).
Toddlerhood is a crucial phase in your child’s development, filled with significant milestones. However, it can also be a tiring time for parents; toddlers are active and curious, which means keeping a close eye on them is essential. You may have heard about “the terrible twos,” and while this phase can be exhausting, it can also be immensely rewarding.
What are key developmental milestones for toddlers?
During toddlerhood, children reach numerous milestones, even though their physical growth may slow down a tad. You’ll be amazed at the various achievements your toddler will make. Here’s a closer look at what to expect during these transformative years:
- Physical Development: If your child hasn’t started walking by their first birthday, they are likely to begin shortly after. Before you know it, they’ll be running, climbing, walking on tiptoes, and even jumping. Plus, they’ll learn to kick a ball, which helps them expend some of that abundant energy.
- Social, Speech, and Emotional Development: Toddlers begin to develop self-awareness, realizing they are separate from you (leading to moments of separation anxiety and then bursts of independence). They start expressing genuine interest in playing with peers, giving you a little break from being their sole playmate. Additionally, toddlers are excellent imitators, which is how they learn many new skills. By the end of this stage, their speech will evolve from simple two- or three-word sentences to more complex and continuous chatter—thank goodness you won’t have to guess their desires anymore!
- Cognitive Development: Your little one will learn to sort objects by color and shape, find hidden items, and engage in imaginative play—watching their creativity unfold is a joy in itself.
What comes after toddlerhood?
Following the toddler stage, children enter preschool years, usually from ages three to five. This period presents its own challenges but comes with a noticeable slowdown in the rapid pace of development that characterizes toddlerhood, which can be a welcome change. After preschool, your child will transition to being a grade-schooler, ages five to twelve, where they will continue to build social skills and physical coordination.
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Summary
In summary, toddlers range from 12 to 36 months, marking a significant phase in development filled with key milestones. While the transition from baby to toddler can be bittersweet, it opens up a world of growth and exploration for your child. As you navigate this exciting stage, understanding the changes and developments will help you support your little one in their journey.

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