🎯 6 Months Baby Milestones

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

📅 6 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

  • Rolls in both directions (tummy to back, back to tummy)
  • Sits with support
  • Supports own weight on legs when held standing
  • Rocks back and forth on hands and knees (pre-crawl)
  • Passes objects from hand to hand

🧠 Cognitive

  • Shows curiosity about things and tries to get out-of-reach objects
  • Begins to understand object permanence (partially)
  • Examines objects carefully with hands and mouth
  • Finds partially hidden objects

💬 Communication

  • Responds to own name
  • Makes vowel sounds (ah, eh, oh) and consonant sounds (m, b)
  • Uses voice to express pleasure and displeasure
  • Babbles with intonation that sounds like real sentences

❤️ Social & Emotional

  • Knows familiar faces, stranger anxiety beginning
  • Enjoys playing with others — peek-a-boo is a hit
  • Responds to own name
  • Shows interest in mirror reflection

⚠️ Talk to Your Paediatrician If…

  • Doesn't roll over in either direction
  • Doesn't try to get things that are in reach
  • Doesn't respond to sounds around them
  • Doesn't make vowel sounds (ah, eh, oh)

Activity Ideas for This Stage

  • Introduce solid foods (single-ingredient purées) — AAP recommends starting at 6 months
  • Play peek-a-boo to build object permanence understanding
  • Provide safe household objects for banging and exploring
  • Create safe floor time for rolling and reaching practice

What to Expect from Milestones in the Growing Infant Stage

Between roughly four and six months, babies typically make some of their most visible developmental leaps — rolling, reaching with purpose, and babbling with real intonation. This is often the stage where milestones start to feel more like discrete "firsts" rather than gradual trends, which can make it more obvious if something seems to be lagging. That said, the order in which individual skills appear can vary quite a bit between babies — some roll before they reach well, others do the reverse — and both patterns are within the normal range. This is also typically when solid foods are introduced, which itself supports fine motor and oral-motor development alongside the milestones tracked separately.

  • Expect skills to appear somewhat out of the "typical" order sometimes — most individual sequencing differences are not a cause for concern.
  • Offer varied textures and safe objects to explore, since hands-on exploration supports several milestone domains at once.
  • If introducing solids, mealtime itself becomes a form of fine motor and oral development practice.
  • A skill that seems to disappear after first appearing (e.g., baby rolled once, then stops for weeks) is usually just inconsistent practice, not regression — though it's worth mentioning at a checkup if it persists.
  • This is a common stage for growth spurts to temporarily affect sleep and mood, which can make new skills seem to stall — this is typically temporary.

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.