Baby Milestones 6–12 Months: What to Expect (and What Not to Worry About)

The CDC's developmental milestones are built around a specific, useful definition: things most children — meaning 75% or more — can typically do by a given age. That word 'most' matters, because it means a meaningful share of perfectly typical babies reach any individual milestone a bit earlier or later than the checklist implies. The value in these lists is spotting genuine, larger gaps worth a conversation — not comparing a baby to a rigid deadline.

Around 6 months

• Knows familiar people and starts to recognize when someone is a stranger

• Looks at their own reflection and seems interested in it

• Puts things in their mouth to explore them — a normal way of learning texture and shape, not a behavior to constantly interrupt

• Reaches out to grab toys with one hand

• Pushes up onto straight arms during tummy time, and leans forward on hands when sitting supported

Around 9 months

• Sits without support for extended periods

• Understands 'no' as a concept, even if they don't yet reliably obey it

• Looks for objects that have been dropped or hidden — a sign object permanence is developing

• Uses fingers to rake at small objects, working toward a more precise pincer grasp

• Babbles with a range of consonant sounds and may combine syllables like 'mama' or 'baba', not necessarily meaningfully yet

Around 12 months

• Pulls to stand and may cruise along furniture; some babies take first independent steps around this time, though the typical range for walking extends well past 12 months

• Uses a mature pincer grasp — thumb and forefinger — to pick up small items

• Responds to simple requests like 'come here' or 'give it to me'

• May say one or two words beyond mama/dada with real meaning attached

• Plays simple interactive games like peekaboo or waving bye-bye

The CDC's free Milestone Tracker app and downloadable checklists (available at cdc.gov) are a genuinely useful way to track this over time without relying on memory or comparison to other babies, since they're built around age-specific checkpoints rather than a single pass/fail moment.

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