💬 24 Months (2 Years) Baby Milestones

CDC Act Early 2024 developmental milestones across motor, cognitive, communication, and social-emotional domains.

📅 24 months📋 CDC 2024WHO Motor Standards
ℹ️Source: CDC Act Early 2024 (75th percentile benchmarks). Milestones describe what most children can do by this age — not what all children do. Every child develops at their own pace. Speak with your paediatrician if you have concerns.

🎯 Milestones by Domain

🏋️ Motor Skills

  • Runs with more coordination
  • Kicks a ball
  • Climbs on furniture and down with assistance
  • Walks up and down stairs holding on
  • Turns pages in a book
  • Builds towers of 4+ blocks

🧠 Cognitive

  • Finds objects even when hidden under two or three covers
  • Begins to sort shapes and colours
  • Follows 2-step instructions ('Pick up your toy and put it in the box')
  • Plays simple make-believe games
  • Completes sentences in familiar books

💬 Communication

  • Uses 2–4 word phrases ('More milk please', 'Go bye-bye')
  • Has 50+ words vocabulary
  • Uses pronouns (I, me, we, you)
  • Strangers can understand about half of what baby says
  • Names items in a picture book

❤️ Social & Emotional

  • Copies others (especially older children)
  • Gets excited around other children
  • Shows increasing independence
  • Shows defiant behaviour (testing limits)
  • Plays mainly beside other children (parallel play evolving into cooperative play)

⚠️ Talk to Your Paediatrician If…

  • Doesn't use 2-word phrases
  • Doesn't know what to do with common objects (brush, phone, fork)
  • Doesn't copy actions and words
  • Doesn't follow simple 2-step instructions
  • Doesn't walk steadily

Activity Ideas for This Stage

  • Ask open-ended questions: 'What is the doggy doing?'
  • Offer limited choices to build decision-making: 'Apple or banana?'
  • Practice counting during play — set realistic expectations (1–5)
  • Consistent routines reduce tantrums and build security

What to Expect from Milestones in the Toddler Stage

By 18 to 24 months, the milestones being tracked shift from physical mobility toward language, independence, and early social-emotional skills like pretend play and cooperation. Vocabulary growth in particular can vary widely between toddlers — some have dozens of words by 18 months while others are just beginning to combine words — and this range is generally considered normal, though a marked plateau or loss of previously used words is one of the more consistent reasons pediatricians recommend a closer look. This stage is also when many toddlers begin testing limits and asserting independence, which is a normal part of social-emotional development rather than a behavioral problem to correct.

  • Vocabulary size varies widely at this age — consistent, steady growth over time matters more than the exact word count at any one visit.
  • A loss of previously acquired words or skills, at any age, is one of the milestones-related signs pediatricians consistently recommend flagging promptly.
  • Expect testing behavior and tantrums as toddlers assert new independence — this is a normal developmental phase, not a discipline failure.
  • Reading and narrating daily routines together continues to be one of the most consistently supported ways to build language at this stage.
  • The 18- and 24-month well-child visits typically include a formal developmental screening — a good opportunity to raise any milestone questions directly.

Understanding CDC Milestone Guidelines

The CDC's "Learn the Signs. Act Early." program, most recently updated in 2022, describes milestones using the 75th percentile — meaning the age by which about 75% of children typically reach that skill, rather than the average age. This is a deliberately conservative approach designed to reduce both unnecessary worry over normal variation and the risk of missing a delay that would benefit from early support. Because of this, a baby who hasn't yet reached a milestone listed for their age isn't necessarily behind — they may simply be in the remaining 25% who reach it slightly later. What matters more than any single milestone is the overall pattern across domains and over time, which is exactly what routine well-child visits are designed to track.

❓ Common Questions About Milestones

What if my baby hasn't reached a milestone listed for their age?

Because milestone ages reflect when about 75% of children typically reach a skill, it's common for individual babies to reach specific milestones a bit earlier or later than listed. A single missed milestone usually isn't a cause for alarm on its own, but it's worth mentioning at your next well-child visit, especially if you notice several delays clustering together across different domains.

Should I be more concerned if my baby was born premature?

For babies born prematurely, pediatricians typically recommend tracking milestones against adjusted age (based on due date) rather than chronological age (based on birth date), especially through the first two years. Ask your pediatrician which age they're using when discussing your baby's development.

Do milestones need to happen in a specific order?

Not exactly — while there are common patterns (like sitting typically preceding crawling), the precise sequence and timing can vary between babies, and some milestones, like crawling, are skipped entirely by some children without it being a concern. What matters more is that skills are generally progressing over time, not that they follow an exact script.

What is a developmental screening, and when does it happen?

A developmental screening is a brief, structured questionnaire or checklist your pediatrician uses at specific well-child visits (commonly 9, 18, and 24 or 30 months) to formally assess progress across all developmental domains. It's a more systematic version of the kind of milestone tracking parents do at home, and it's designed to catch patterns that might not be obvious from any single visit.

Is it normal for a baby to seem to lose a skill they already had?

Occasional inconsistency — showing a skill once and then not again for a while — is common and usually reflects normal practice rather than regression. A genuine, sustained loss of previously acquired skills at any age is different and is one of the more consistent reasons pediatricians recommend a prompt evaluation, so it's worth flagging clearly if you notice it.

How much do milestones vary between individual babies?

Quite a bit — genetics, birth history, and even simple practice opportunities (like how much tummy time a baby gets) all influence timing within the normal range. This is part of why milestone lists describe typical ranges rather than fixed deadlines, and why your pediatrician's assessment of your specific baby matters more than a general list.