6-Month Developmental Milestones: What to Expect

father smiling and holding laughing baby

Key Takeaways

  • Look for growing connection. Familiar faces, shared laughter, and little “conversations” are important parts of development.  
  • Make room for movement. Supervised floor play gives your baby opportunities to reach, push up, and practice rolling. 
  • Sitting is still developing. At six months, babies may use their hands to help balance. Sitting independently comes later for many babies.   
  • Everyday moments count. Talking during diaper changes, sharing a book, and responding to your baby’s sounds all support learning.   
  • Bring up concerns early. If your baby is missing a milestone, loses a skill, or something concerns you, talk with their provider. 

Six-month-olds have so much to share—a squeal, a reaching hand, a smile when you walk into the room. Your baby is discovering new ways to move, explore, and connect with you. 

You may also be wondering, “Should my baby be sitting already?” or “Are we doing enough tummy time?” Every child grows at their own pace. Development is never a race. Knowing what to look for can help you enjoy your baby’s discoveries and bring questions to their health care provider. 

Below, you’ll find six-month milestones and simple ways to support them. For more ideas for playing together, explore ZERO TO THREE’s milestone kits with age-appropriate play materials. 

6-Month-Old Developmental Milestones at a Glance

Here are some skills and everyday experiences you may notice around six months. The vision and hearing row offers things to observe during play; it is not an additional CDC milestone category.

Developmental AreaWhat your baby can dowhat you can do
Physical and Movement• Rolls from tummy to back
• Pushes up on straight arms during tummy time
• Leans on hands for support when sitting
Offer supervised floor play and stay close when your baby practices sitting.
Vision and Hearing • Watches interesting objects and faces
• Listens to familiar voices and nearby sounds
Bring your face into view, name what your baby notices, and leave pauses for a response.
Communication and Language • Takes turns making sounds with you
• Makes squealing sounds
• Blows raspberries
Copy a sound, pause, and let your baby take another turn.
Social-Emotional Development and Bonding• Recognizes familiar people
• Laughs
• Enjoys looking at their reflection in a mirror
Share smiles and games, and comfort your baby when they need you.
Cognitive and Sensory Development • Reaches for a toy they want
• Explores objects with their mouth
• Closes their lips to show they do not want more food
Offer safe objects to explore and respond to your baby’s cues.

Physical and Movement Milestones at 6 Months

Six-month physical and movement milestones include rolling from tummy to back, pushing up on straight arms during tummy time, and leaning on hands for support while sitting. Your baby is also practicing reaching and grasping through everyday play. 

“I’m learning how my body moves. Give me a safe place to practice—with you nearby.” 

Your baby’s movements are becoming more purposeful. A toy that once caught a passing swipe may now inspire a determined reach. Watch how your baby opens their fingers, grasps an object, and brings a hand toward their mouth. 

During awake time, offer space on the floor to stretch their arms and legs. Stay beside your baby in a sitting position and support them as needed. Let them practice without pulling them into a position they cannot manage. 

  • Get down together. Place yourself at your baby’s eye level during tummy time.
  • Make reaching inviting. Hold a safe toy nearby and give your baby time to try.
  • Keep practice comfortable. If your baby becomes upset or tired, take a break. 

For ways to make short sessions more engaging, try these tummy time tips.

Should My Six-Month-Old Sit Independently or Roll Both Ways?

Independent sitting is not a required six-month CDC milestone; it appears on the nine-month checklist. The six-month rolling milestone is tummy to back, rather than rolling in both directions.  

Some babies show these skills earlier. That does not make them a goal you need to hurry your baby toward. Offer opportunities to move, notice what is changing, and discuss questions with their provider. 

Vision and Hearing at 6 Months

At six months, your baby uses vision and hearing to explore faces, objects, voices, and other sounds. During everyday play, you may notice them watching an interesting toy or responding to a familiar voice. These observations complement the milestone checklist rather than form a separate CDC milestone category. 

“There’s so much to notice. Help me explore one thing at a time.” 

Your face, a moving toy, and a familiar song can make ordinary moments interesting. Notice where your baby looks and how they respond when you speak. 

You might say, “You’re looking at the red cup. Here it is.” Move it slowly and give your baby time to watch. During a quiet moment, talk from nearby and observe their response. 

You do not need flashing toys or a constant stream of entertainment. Turn off background television during play so you can hear each other. Your voice and attention give your baby plenty to explore. 

If you are concerned about how your baby sees or responds to sound, share what you have noticed with their provider. 

dad and baby smiling at each other

Communication and Language Milestones at 6 Months

Six-month communication and language milestones include taking turns making sounds with you, squealing, and blowing raspberries. These early exchanges help your baby practice communication; meaningful words are not expected yet. 

“My sounds are part of our conversation. When you answer, I learn that you’re listening.” 

A squeal can become the beginning of a back-and-forth exchange. Your baby makes a sound. You answer. Then you pause. 

Try saying, “You have something to tell me!” Copy their sound or add a few words: “You’re excited to see Nana.” 

These exchanges are sometimes called serve and return—your baby reaches out with a look, sound, or movement, and you respond. You can do this while getting dressed, waiting for a bottle, or taking a walk.

  • Describe what you’re doing. “One sock, then the other sock.”
  • Leave room for a turn. Pause instead of filling every quiet moment.
  • Follow their attention. Talk about the toy or person your baby is watching. 

Should My Six-Month Old Be Saying Words?

Meaningful words are not expected at six months. Sounds, facial expressions, and movements are your baby’s ways of sharing what they need and how they feel. 

Enjoy the conversation as it is. You can answer a cheerful squeal with, “Yes, that was fun!” or a frustrated sound with, “You want that toy. I’ll help you.” 

Social-Emotional Development and Bonding

Six-month social-emotional milestones include recognizing familiar people, laughing, and enjoying looking at their reflection in a mirror. Your baby builds connection through shared smiles, playful exchanges, and comfort from trusted caregivers. 

“I’m getting to know the people who care for me. Your comfort helps me feel safe.” 

Your baby’s relationships are growing. A grandparent’s familiar song or a caregiver’s gentle greeting may bring a smile. Other people may need more time to become familiar. 

Your baby’s personality is showing, too. One baby enjoys lots of activity; another needs a quieter place to settle. Notice what your baby seems to enjoy and when they need a break. 

What it’s like for you: People may be eager to touch or hold your baby when you are out together. Like Sarita, whose baby Kyle draws plenty of attention, you may sometimes need to set a boundary. 

You can say, “He’s taking a break from being held right now,” or “Please wave to him instead.” You can welcome someone’s interest while protecting your baby’s comfort. 

Holding, soothing, and responding to your baby help them learn that they can count on you. Comfort does not spoil a baby. 

Helping Your Baby Feel Comfortable With a New Caregiver

Leaving your baby with someone new can bring up feelings for both of you. 

  • Spend time together first. Let the caregiver join you for a familiar activity before your first outing.
  • Share what helps. Explain your baby’s feeding routine, tired signals, and favorite ways to be comforted.
  • Keep your goodbye warm and clear. “I’m going out. Nana will take care of you, and I’ll come back.”
  • Allow time to adjust. A familiar song or routine can help the caregiver connect with your baby. 

For more ideas, read about supporting separation anxiety.

Cognitive and Sensory Milestones at 6 Months

Six-month cognitive and sensory milestones include reaching for a toy they want, exploring objects with their mouth, and closing their lips to show they do not want more food. These everyday actions show how your baby learns through exploration and communicates their needs. 

“I learn by looking, touching, listening—and putting things in my mouth.” 

Cognitive development means learning, thinking, and beginning to solve problems. At this age, that learning happens through hands-on exploration. 

Your baby may reach toward an interesting toy, turn it in their hands, or study what happens when it falls. You can name the experience: “You dropped the cup. It landed on the floor.” 

There is no need to turn play into a lesson. Give your baby time to investigate, and respond to what interests them. 

Mealtimes offer another chance to listen. When your baby closes their mouth or turns away, pause rather than encouraging another bite. Their cues are part of your conversation. 

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Why Does My Six-Month-Old Put Everything in Their Mouth?

Mouthing is one way babies explore. That includes books—which can make reading feel more like chewing than story time. 

You do not have to finish a book or read every word. Point to a picture, make an animal sound, or describe what your baby is touching. Choose sturdy books made for babies and check them for damage. 

Keep small objects, loose pieces, button batteries, and magnets out of reach. Offer clean, age-appropriate items designed for baby use, and stay nearby during play. 

Simple Activities for a Six-Month-Old

A few minutes of shared play can fit into your day. Choose an activity when your baby is awake and comfortable, and stop when they turn away, fuss, or seem tired. 

Tummy Time and Reaching Games

Lie beside your baby on the floor. Put a safe toy nearby or bring your face into view. Say, “Here I am!” and give them time to look or reach. 

Supports: Movement, reaching, and connection. 

Copy My Sounds

When your baby makes a sound, copy it. Then wait. If they answer, take another turn. 

You might say, “Ahh! I hear you.” 

Supports: Communication, listening, and turn-taking. 

Read a Favorite Book

Let your baby look, touch, and explore a sturdy board or cloth book. Name one picture: “A dog! The dog says woof.” 

A page or two is enough if that is what your baby enjoys. 

Supports: Early language, shared attention, and bonding. 

Mirror Play

Hold your baby beside a securely positioned, baby-safe mirror. Smile, make a face, or point to their reflection. 

Say, “There you are! I see your smile.” 

Supports: Social interaction and visual exploration. 

Popsicle Stick Puppets

For an adult-led game, attach a large picture securely to a craft stick and move it gently while you talk or sing. 

Keep the puppet in your hand and out of your baby’s reach. Craft sticks, paper, and glued pieces are not baby chew toys. 

Supports: Watching, listening, and shared enjoyment. 

"Teeny Tug-of-War"

Make this a gentle grasping game. With your baby lying safely on their back, offer one end of a clean washcloth while you hold the other. 

Let your baby grip and explore it. Keep the cloth slack—do not pull their arms or use it to bring them into sitting. 

Say, “You’ve got it! We’re holding it together.” 

Supports: Grasping, touch, and back-and-forth play. 

Everyday Bath-Time Learning

Nana turns bath time into connection by singing, naming body parts, and talking about the water. 

You can try the same: “Here are your toes. Now your tummy. The washcloth feels wet.” 

Keep your baby supported and within reach throughout the bath. Gather supplies beforehand and never leave them alone, even briefly. 

Supports: Language, sensory exploration, and bonding. 

How Can I Support My Six-Month-Old's Development?

“You don’t have to entertain me all day. Notice what I’m telling you, and we can learn together.” 

Small, responsive moments make a big difference. Your baby learns through the care you already provide. 

  • Follow their lead. If a toy catches their attention, explore it together.
  • Name feelings. “That loud sound surprised you. I’m here.”
  • Offer comfort. Hold, rock, or speak softly when your baby needs help settling.
  • Make space for exploration. Give them safe floor time and simple objects to investigate.
  • Let ordinary routines count. Feeding, changing, and getting ready for bed are opportunities to connect.

You do not need a packed activity schedule. Remember to notice what is going well, too. It is okay to feel proud of a new skill—or a good moment together.

What If I'm Too Tired or Overwhelmed to Play?

Some days, the basics take all your energy. Grief, stress, and exhaustion can make connection feel harder. 

Start small. Hold your baby close during a feed. Say their name. Rest together while another trusted adult takes care of a task. 

If you are struggling, ask someone you trust or your own health care provider for support. You deserve care, too. 

Explore the 6–12 Month Play Kit

Want a few materials to help you get started? The 6–12 Month Play Kit includes stacking cups, soft feeding spoons, and a board book for shared exploration. Use them at your baby’s pace: hold a cup together, look at a picture, or explore a new texture.  

Explore milestone kits and find ideas for your next moment of play together. 

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How to Understand Your Baby's Milestones

Developmental milestones are skills that help you notice how your baby is growing. The CDC’s age-based lists describe what at least 75% of children can do by that age. A checklist helps you track development; it does not diagnose a condition or replace developmental screening—a structured check of your child’s development.  

You may see one skill happen quickly while another takes more practice. Keep a few notes about what your baby does, what is starting to change, and any questions you want to share. 

Learn more about revised developmental milestones and how to use them.

Using Corrected Age for a Premature Baby

If your baby was born early, their provider may use corrected age—their age adjusted for how many weeks before their due date they were born. 

For example, a baby who is 24 weeks old and was born eight weeks early has a corrected age of 16 weeks. Corrected age is generally used to understand development during the first two years. Ask your provider which milestones to follow for your baby.  

premature development

Is My Six-Month-Old Ready for Solid Foods?

Around six months, many babies are ready to begin solid foods alongside breast milk or infant formula. 

Readiness involves more than a birthday. Look for steady head and neck control, sitting upright with support, opening the mouth for food, and swallowing rather than pushing food back out. Talk with your baby’s provider about starting foods and choosing safe textures.  

Stay with your baby while they eat and follow their signals. “You’re turning away. It looks like you’re finished.” 

Sleep and Safety as Your Baby Becomes More Mobile

Night waking can be tiring. You may also notice that your baby’s sleep changes as family routines or daily experiences change. 

A familiar wind-down can help: dim the lights, share a book, sing a song, and offer comfort. Ask your provider about feeding or sleep questions that are affecting your family. 

Keep these safety practices in place: 

  • Start every sleep on the back. Place your baby on their back for naps and nighttime sleep.
  • Use a firm, flat sleep surface. Choose a safety-approved crib, bassinet, or play yard with a fitted sheet.
  • Keep the sleep space clear. Leave out pillows, loose blankets, toys, and other soft objects.
  • Use a separate sleep space. After feeding or comforting your baby, return them to their own bed before you sleep.

If your baby can roll comfortably both ways, you do not need to keep turning them back after they roll themselves. Continue placing them on their back at the start of each sleep.  

Stop swaddling—wrapping your baby snugly in a blanket—as soon as they show signs of trying to roll.  

For reassurance about common expectations, read common myths about baby sleep.

What If My Baby Is Not Meeting a Milestone?

If your baby is missing a milestone, has lost a skill, or you have another concern, contact their pediatrician or other health care provider. You do not have to wait until the next scheduled visit.

  • Describe what you notice. “I’ve noticed that my baby…” gives you a place to start.
  • Bring examples. Share your notes or a short video of the behavior that concerns you.
  • Ask about screening. You can say, “Would a developmental screening help us understand this?”
  • Ask about next steps. If concerns remain, discuss whether an evaluation is needed.

In the United States, you can also contact your state or territory’s early intervention program—services that support young children with developmental needs. For children under three, families can request an evaluation without waiting for a diagnosis or a doctor’s referral.  

Asking for help is one way you care for your baby.

What Comes Next After Six Months?

Over the coming months, your baby may begin sitting more steadily, passing objects between hands, and making longer strings of sounds. These are among the skills on the CDC’s nine-month checklist.  

Later, you may notice new ways of getting around or that your baby pulls up to stand. Walking belongs to a later stage; your six-month-old does not need to practice being a toddler. 

Continue making room for safe exploration and shared play. For the next chapter, explore what to expect at seven months. 

Your baby’s development unfolds through many ordinary moments. A familiar voice, a comforting hold, an answer to a little sound—these moments tell your baby, “You matter to me.” That relationship is the foundation you keep building together. 

What’s on Your Mind? Questions From Parents of 6-Month-Olds

Next Up
From Baby to Big Kid: Month 7
By Claire Lerner and Rebecca Parlakian