By 6 months, most babies can laugh, recognize familiar people, roll from tummy to back, and are starting to sit with hand support. These milestones represent what roughly 75% of babies can do by this age, so there’s a normal range. Some babies hit certain skills a few weeks early, others a few weeks late. Here’s what to look for across every area of development.
Social and Emotional Skills
At 6 months, your baby’s social world is expanding fast. They can distinguish familiar people from strangers, and you’ll notice a clear difference in how they react to each. A grandparent who visits often gets smiles and excitement; a new face might get a long, cautious stare. This is a sign their memory and social awareness are developing on track.
Babies this age also love looking at themselves in a mirror. They don’t yet understand that the reflection is them, but the face looking back is endlessly entertaining. And laughing is a true milestone now. Not just the social smile you’ve been seeing for months, but genuine belly laughs in response to peek-a-boo, funny sounds, or something unexpected.
Language and Communication
Your baby isn’t forming words yet, but they’re laying serious groundwork. At 6 months, you should hear squealing noises, vowel sounds like “aah” and “ooh,” and the beginnings of consonant-vowel combinations like “ba” or “da.” Some babies start repeating these in strings: “da-da-da-da.” This is early babbling, and it’s one of the most important precursors to real speech.
One milestone that’s easy to miss is turn-taking. When you talk to your baby, pause, and they vocalize back, that’s a genuine conversation in their mind. They’re learning the rhythm of communication. Blowing raspberries (sticking their tongue out and blowing) is another classic 6-month skill. It looks silly, but it’s actually your baby practicing mouth and tongue control they’ll need for speech later.
Research from the National Institute of Child Health and Human Development suggests that how parents respond to babbling matters. When you respond to your baby’s sounds with words and attention, it reinforces their attempts and can speed up language development over time.
Thinking and Problem-Solving
Cognitive development at 6 months shows up in three key behaviors. First, your baby reaches for toys they want. This sounds simple, but it requires visual tracking, hand-eye coordination, and intentional planning. Second, they explore objects by putting them in their mouth. Everything goes straight to the lips and tongue because that’s how babies this age gather the most sensory information about shape, texture, and temperature.
Third, and this one surprises many parents, your baby can now communicate a preference about food. Closing their lips when they don’t want more is an early form of decision-making. They’re not just passively accepting what comes their way anymore.
Movement and Physical Development
Rolling from tummy to back is the headline physical milestone at 6 months. Not all babies roll in both directions yet (back to tummy often comes a little later), but tummy-to-back rolling should be happening. During tummy time, your baby should also be pushing up with straight arms, lifting their chest off the floor. This builds the upper body strength they’ll need for crawling in the coming months.
Sitting is in progress but not yet independent for most 6-month-olds. The typical picture is a baby who can sit upright while leaning forward on their hands for support, sometimes called “tripod sitting.” They’ll topple over without that hand support, so always have a soft surface behind them. Independent, hands-free sitting usually comes closer to 7 or 8 months.
Sleep at 6 Months
Most 6-month-olds need about 10 to 11 hours of sleep at night, plus around three naps during the day. Each nap typically runs one to two hours, with the third nap often being shorter. Some babies start transitioning to two naps around this age, but three is still normal. Night waking hasn’t necessarily disappeared, though many babies are physically capable of longer stretches of sleep by now.
Starting Solid Foods
Six months is when most babies are developmentally ready for solid foods. The signs of readiness include sitting up with support, having good head and neck control, opening the mouth when food is offered, and swallowing food rather than pushing it back out with the tongue. Your baby should also be bringing objects to their mouth and starting to grasp small items.
You don’t need to start with any particular food. Vegetables, fruits, meat, and iron-fortified infant cereals are all reasonable first options. If you’re using infant cereal, varying the type (oat, barley, multigrain) is better than sticking only with rice cereal. By 7 or 8 months, your baby can be eating from multiple food groups, including yogurt and soft cheeses without added sugars, proteins, and whole grains. Breast milk or formula remains the primary source of nutrition through the first year, with solids gradually supplementing it.
Safety as Mobility Increases
Once your baby starts rolling and sitting, their ability to get into trouble increases dramatically. A baby who couldn’t move off a blanket last month can now roll to the edge of a bed or couch in seconds. Never leave a rolling baby unattended on any elevated surface, even for a moment.
This is also the time to start baby-proofing in earnest. Anchor heavy furniture like dressers, bookshelves, and TV stands to the wall, because babies will soon pull themselves up on anything within reach. Install safety gates at the top and bottom of stairs (screw-mounted gates at the top, not pressure-mounted). Put corner bumpers on sharp furniture edges. Cover electrical outlets with protectors that a small child can’t remove or choke on. And start scanning floors regularly for small objects that could be choking hazards, since everything your baby picks up is going straight into their mouth.
When a Milestone Is Missing
The CDC’s milestone checklist represents what 75% or more of babies can do by 6 months. That means a quarter of perfectly healthy babies haven’t hit some of these yet. Being a few weeks behind on one skill is rarely cause for concern, especially if your baby is making progress.
What does warrant a conversation with your pediatrician is a pattern of missing milestones across categories, or a baby who has lost skills they previously had. If your baby doesn’t laugh, doesn’t seem to recognize familiar people, doesn’t reach for objects, or shows no interest in putting things in their mouth, those are worth bringing up. Early intervention programs are available in every state, and the earlier a delay is identified, the more effective support tends to be. You don’t need a diagnosis to request a developmental screening.