6-Month-Old Milestones: Development, Growth, Speech, and Sleep

Half a birthday. Your baby is grabbing everything within arm's reach, rolling toward toys they want, and making sounds that are starting to feel like the beginning of conversation. The floppy newborn phase is genuinely over.

Six months is also the age pediatricians circle on the calendar. It's when most babies are ready for their first taste of solid food, when a real personality starts showing up, and when the well visit checks a longer list of skills than before. Here's what most 6-month-olds are doing, grouped the way your pediatrician thinks about it, with the numbers and the sources behind them.

What should a 6-month-old be doing?

Most 6-month-olds are rolling from tummy to back, propping themselves up on their hands to sit, reaching out to grab toys, babbling strings of sounds, and laughing.¹ The CDC updated its milestone checklists in 2022 so that each listed skill is something about 75% of babies can do by that age, not just the average.² That matters: if your baby is doing most of these, they're squarely on track, and a wide range of timing is still completely normal.

Pediatricians tend to watch four rough tracks maturing at once. Here's each one.

Movement and physical development

Rolling tummy to back. By 6 months most babies roll from their stomach onto their back.¹ Back-to-tummy usually comes a bit later, so if your baby only rolls one direction so far, that's expected.

Pushing up on straight arms. During tummy time, your baby can now push their chest well off the floor with arms extended, getting a much better view of the room.¹

Propping to sit. A 6-month-old typically leans forward on their hands to hold themselves up in a sitting position.¹ Fully independent sitting (hands free) is a slightly later skill, one the CDC lists closer to 9 months.³

Bearing weight on the legs. Held upright under the arms, many babies this age push down and take weight on both legs, sometimes with an enthusiastic bounce.

Now that rolling has arrived, two safety notes. Stop swaddling the moment your baby shows any sign of rolling, because a swaddled baby who rolls to their stomach can't push up or turn their head freely.⁴ And do a quick sweep of the floor space for small objects, since everything is heading straight for the mouth now.

Hands and fine motor skills

Reaching and grabbing. Your baby now reaches deliberately for a toy they want and closes a hand around it.¹ Early grasping is a whole-hand "rake" rather than a precise pinch, which comes later.

Passing objects hand to hand. Transferring a toy from one hand to the other is a favorite new trick around this age, and it's a real cognitive step, not just fidgeting.

Everything to the mouth. Mouthing objects is how babies explore texture and shape at 6 months, and the CDC lists it as a normal cognitive milestone rather than a habit to stop.¹ It's the reason floor safety matters more now.

Speech and language

Taking turns with sounds. Your baby makes a sound, waits, and "answers" when you respond.¹ That back-and-forth is the scaffolding real conversation is built on.

Babbling. Expect strings like "bababa," "dadada," and "mamama." They sound like words, but babies generally don't attach meaning to "mama" or "dada" until closer to 9 to 12 months, so you're hearing practice, not a first word yet.⁵

Blowing raspberries. Sticking the tongue out and blowing is an actual milestone.¹ It builds the lip and tongue control that later feeds both speech and eating.

Squealing. High-pitched squeals, happy or otherwise, are how a 6-month-old stretches their vocal range.¹

Social and emotional

Knowing familiar people. Your baby now clearly recognizes the people they see most and reacts differently to strangers.¹ A little wariness around new faces, the early form of stranger anxiety, often starts around now and is a sign of healthy attachment, not a problem.

Laughing. Real laughs, often at things that make no sense to you, are a 6-month staple.¹

Loving the mirror. Babies this age are fascinated by their own reflection.¹ They won't recognize themselves as themselves for many months, but they'll happily study the baby looking back.

How much sleep does a 6-month-old need?

Around 14 hours in 24, typically about 10.5 at night and 3.5 across three naps.⁶ Wake windows land near 2 to 3 hours, shortest before the first nap and longest before bed.

Six months sits right before the 3-to-2 nap transition, which usually happens between 7 and 8 months. If the third nap is getting hard to fit in, that's the first hint it's coming. We break the whole day down, with a sample schedule, in our 6-month-old sleep schedule post, and the numbers for every age live in our wake windows chart.

Feeding a 6-month-old: milk, first solids, and water

Milk (breast or formula) is still your baby's main nutrition at 6 months, and solids are an addition, not a replacement.⁷ The AAP recommends starting solids around 6 months, once your baby shows the readiness signs.⁷

The readiness signs to look for: sitting with support and steady head control, showing real interest in food (watching you eat, reaching for it), and having lost the tongue-thrust reflex that pushes food back out.⁷ Age is a guideline; these signs are the actual green light.

Start with one solid meal a day and build slowly. At this stage a few spoonfuls counts as a meal, and the goal is exposure to flavors and textures, not calories. Whether you spoon-feed purees or try baby-led weaning with soft finger foods, both are reasonable approaches.

This is also the moment to introduce the common allergens rather than delay them. The LEAP trial found that regularly feeding peanut to high-risk infants from 4 to 11 months cut their chance of peanut allergy by roughly 80% by age 5.⁸ On that evidence, national guidelines now recommend introducing peanut, egg, and other allergens early and keeping them in the diet, in age-appropriate forms.⁹ Talk to your pediatrician first if your baby has severe eczema or a known food allergy.

You can offer a little water with meals now too. The AAP suggests keeping it to no more than about 1 cup (8 ounces) a day for 6- to 12-month-olds, since milk still supplies the fluids they need.⁷ A few sips from an open cup is mostly a skill-building exercise at this point, and it will be messy.

Our feeding guide has amounts and frequencies broken out by age.

Growth at 6 months

Weight gain slows in the second half of the first year. This month most babies add somewhere around 1 to 1.25 pounds and grow roughly half an inch.¹⁰ A little more or less is normal.

Your pediatrician will plot height, weight, and head circumference against the WHO growth standards at the 6-month well visit.¹¹ What they're watching is the curve, not a single number. A baby who has tracked along the 15th percentile since birth and keeps doing so is growing exactly as they should.

6-month milestone checklist

Development is a range, not a schedule, and not every baby hits every item on the same week. Most 6-month-olds can:

• Roll from tummy to back
• Push up on straight arms during tummy time
• Lean on their hands to prop-sit
• Reach for and grab a toy
• Pass a toy from one hand to the other
• Bring objects to their mouth to explore them
• Take turns making sounds with you
• Babble "bababa," "dadada," "mamama"
• Blow raspberries and squeal
• Know familiar faces and show some wariness of strangers
• Laugh

6-month red flags: when to call the doctor

Every baby is on their own timeline, but a few signs around 6 months are worth raising with your pediatrician. Check in if your baby¹:

• Isn't trying to roll or push up during tummy time
• Doesn't reach for objects that are close by
• Shows no affection for the people who care for them
• Doesn't respond to sounds around them
• Has trouble getting things to their mouth
• Seems unusually stiff or unusually floppy
• Isn't making vowel sounds ("ah," "eh," "oh")
• Isn't laughing or making squealing sounds

None of these on its own means something is wrong, and you know your baby better than a list does. If something feels off, the "act early" move is to ask sooner rather than wait and see.²

Three ways to support development at 6 months

Point and name. When your baby looks at something, point to it and say what it is. Naming the world during ordinary moments (diaper changes, walks, meals) is one of the most reliable ways to build early language.

Make rolling and reaching worth it. Put a favorite toy just out of reach during floor time. Working for it is exactly the practice that builds the core strength behind sitting, and eventually crawling.

Offer the allergens. Once your pediatrician gives the go-ahead, include small amounts of peanut, egg, and dairy regularly as you start solids. Early, consistent exposure is what the research links to lower allergy risk.⁸

nappi tracks feeds, sleep, and milestones in one place, so the 6-month well visit becomes a matter of glancing at what actually happened instead of reconstructing it from memory.

Frequently Asked Questions

Should a 6-month-old be sitting up on their own?

Most are propping themselves up on their hands, not sitting fully hands-free yet. The CDC lists independent sitting closer to 9 months.³ If your baby can hold their head steady and prop-sit with hands down, they're on track.

Is it normal that my 6-month-old only says "dada" and not "mama"?

Completely. At this age "bababa," "dadada," and "mamama" are all just babbling practice with no meaning attached to any of them. Babies typically connect a word to a person around 9 to 12 months.⁵

My 6-month-old suddenly cries around strangers. What happened?

That's stranger wariness, the early form of stranger anxiety, and it usually shows up around this age. It means your baby has learned to tell familiar people from unfamiliar ones, which is a healthy sign of attachment.¹

Do I have to start solids exactly at 6 months?

Around 6 months is the guideline, but readiness signs matter more than the date. Good head control, sitting with support, interest in food, and a faded tongue-thrust reflex are the real green light.⁷ A week or two either way is fine.

When will my baby roll both ways?

Tummy-to-back tends to come first, often by 6 months, with back-to-tummy following in the weeks after. If your baby rolls one direction and pushes up strongly on their arms, the other direction is usually not far off.¹