understanding the first 1,000 days of development
The Milestones You Might Be Missing: Why Early Signs Matter More Than You Think
When Sara was born with Down syndrome, her mother Brenda heard words no parent should hear: “There’s nothing we can do.” But Brenda knew something those doctors didn’t-that the earliest days, weeks, and months of a child’s life are when everything is possible.
She was right. Science has since proven what mother’s intuition knew all along.
Why The First 1,000 Days Change Everything
Research shows that 80 percent of a child’s brain development occurs within the first 1,000 days of life, making those three years critical for lifelong health, learning, and success. That’s from the moment of conception through a child’s second birthday.
Think about that. By age 3, a child’s brain is already more than 80 percent of adult size, and by age 5, it’s grown to about 90 percent. But it’s not just about size-it’s about the millions of neural connections forming every single day.
In the first few years of life, more than 1 million new neural connections form every second. These connections determine how your child will learn, speak, move, and interact with the world for the rest of their lives.
What This Means for Your Child
During the first 1,000 days, the brain grows more quickly than at any other time in a person’s life, with nutrition providing the fuel that drives much of this early brain growth and development. This rapid growth makes the brain highly adaptable-what scientists call “plastic”-meaning it has the greatest capacity to observe, adapt, and learn new skills.
But here’s what matters most: these brain changes are dependent on each other, meaning that if the brain lacks a necessary building block during this time, it will miss out on the developmental process that building block was supposed to make.
This is why early intervention isn’t just helpful, it’s transformative.
The Milestones That Matter: What to Look For
As a parent, you can’t see inside your child’s brain. But you can see the milestones-those precious moments when your baby smiles for the first time, reaches for a toy, or says “mama.” These aren’t just adorable memories to capture on camera. They’re manifestations of the complex neural connections building inside your child’s developing brain.
Here’s what to watch for:
Birth to 1 Months: Building Foundations
During these earliest weeks, your baby’s brain is establishing the most fundamental connections.
What You’ll See:
- Holds head in prone position
- Anticipatory behavior at feeding
- Visual fixation and visual following
- Stops crying with novel stimulus, holding and rocking
- Alert response to light and sound
What’s Happening Inside: Your baby is learning that they’re safe, that their needs will be met, and that they can trust the people around them. These early emotional connections form the foundation for all future learning.
What You Can Do:
- Respond positively when your baby makes sounds-smile, talk back, act excited
- Hold your baby close and make eye contact
- Talk to your baby throughout the day about what you’re doing
- Sing, read, and play with your baby every day
When to Be Concerned: If your baby doesn’t calm when you pick them up, doesn’t look at faces, or shows no response to sounds by 2 months, talk to your pediatrician.
2 to 4 Months: Discovering the World
Your baby is becoming more alert and engaged with everything around them.
What You’ll See:
- Smiles on their own to get your attention
- Controls bottle with hands
- Looks at you, moves, or makes sounds to get or keep your attention
- Makes sounds like “oooo,” “aahh” (cooing)
- Turns head toward the sound of your voice
- Holds head steady without support when being held
- Holds a toy when you put it in their hand
- Uses their arm to swing at toys
- Brings hands to mouth
- Pushes up onto elbows/forearms when on tummy
What’s Happening Inside: The connections in your baby’s brain responsible for vision, hearing, and social engagement are rapidly strengthening. They’re learning cause and effect—that their actions get responses from you.
What You Can Do:
- Have “conversations” with your baby—when they coo, respond back
- Give your baby safe, easy-to-hold toys like rattles or soft books
- Lay your baby on their back and show them bright-colored toys, moving them slowly so baby can track them
- Give your baby supervised tummy time every day to build strength
- Sing and play peek-a-boo
When to Be Concerned: If by 4 months your baby isn’t making sounds, doesn’t bring hands to mouth, doesn’t push up when on tummy, or doesn’t respond to loud sounds, schedule a developmental screening.
4 to 6 Months: Reaching and Exploring
This is when babies become little scientists, exploring their world through touch, taste, and movement.
What You’ll See:
- Knows familiar people
- Likes to look at themselves in a mirror
- Laughs
- Takes turns making sounds with you
- Blows “raspberries” (sticks tongue out and blows)
- Makes squealing noises
- Moves to bring things to mouth
- Reaches for toys they want
- Closes lips to show they don’t want more food
- Rolls from tummy to back
- Pushes up with straight arms when on tummy
- Leans on hands to support themselves when sitting
What’s Happening Inside: Your baby’s motor control is rapidly developing. The connections between the brain’s motor cortex and muscles are strengthening, allowing for increasingly intentional movements. Language centers are also activating as they experiment with new sounds.
What You Can Do:
- Play on the floor with your baby every day
- Give your baby safe toys to explore and mouth (they’re learning through all their senses)
- Read board books with bright pictures and point to images
- Let your baby have time to move freely throughout the day
- Respond to your baby’s sounds and expressions with your own sounds and smiles
When to Be Concerned: If your baby doesn’t reach for objects, doesn’t roll over in either direction, can’t support their head well, or doesn’t make vowel sounds by 6 months, contact your pediatrician.
7 to 9 Months: Becoming Mobile
Get ready-your baby is on the move, and their brain is working overtime to coordinate all these new skills.
What You’ll See:
- Is shy, clingy, or fearful around strangers (this is normal and healthy!)
- Shows several facial expressions like happy, sad, angry, and surprised
- Looks when you call their name
- Reacts when you leave (looks, reaches for you, or cries)
- Smiles or laughs when you play peek-a-boo
- Looks at a few things when you name them (responds to “Where’s the ball?”)
- Makes different sounds like “mamamama” and “babababa”
- Lifts arms to be picked up
- Gets to sitting position by themselves
- Moves things from one hand to the other
- Uses fingers to “rake” food toward themselves
- Sits without support
- Says dada or mama
What’s Happening Inside: Your baby’s brain is integrating multiple skills at once—balance, coordination, spatial awareness, and memory. The hippocampus (memory center) is developing rapidly, allowing your baby to remember people and objects even when they can’t see them.
What You Can Do:
- Play games that build memory, like hiding toys under a blanket and asking “Where did it go?”
- Give your baby safe spaces to explore (babyproofing is essential now)
- Offer finger foods they can practice picking up
- Name objects and people throughout the day
- Play simple games like pat-a-cake and peek-a-boo
When to Be Concerned: If your baby doesn’t sit with support, doesn’t babble (“mama,” “baba”), doesn’t play games like peek-a-boo, or doesn’t recognize familiar people by 9 months, request a developmental screening.
10 to 15 Months: First Words and Steps
This is when life changes dramatically—your baby is becoming a toddler.
What You’ll See (by 12 months):
- Plays games with you like pat-a-cake
- Waves “bye-bye”
- Understands “no” (pauses briefly or stops when you say it)
- Puts something in a container, like a block in a cup
- Looks for things they see you hide
- Pulls up to stand
- Walks, holding onto furniture (“cruising”)
- Drinks from a cup without a lid (as you hold it)
- Picks things up between thumb and pointer finger
What You’ll See (by 15 months):
- Copies other children while playing
- Shows you an object they like
- Claps when excited
- Hugs stuffed dolls or other toys
- Shows affection (hugs, cuddles, or kisses you)
- Tries to use things the right way (phone, cup, book)
- Stacks at least two small objects
- Takes a few steps on their own
- Uses fingers to feed themselves some food
What’s Happening Inside: Language explosion! The connections in your child’s language centers are multiplying rapidly. They understand far more than they can say. Motor planning is also developing; they’re learning to coordinate complex movements like walking and manipulating objects with intention.
What You Can Do:
- Read every day. Point to pictures and name what you see
- Talk about what you’re doing throughout the day
- Give your child safe places to practice walking
- Celebrate their attempts at new words, even if they’re not perfect
- Let your child practice feeding themselves (yes, it’s messy, but it’s crucial for development)
- Sing songs with hand motions
- Play with blocks, stacking cups, and simple shape sorters
When to Be Concerned: If by 15 months your child doesn’t point to show you things, doesn’t walk, doesn’t use gestures like waving or shaking head, or doesn’t say at least one word, schedule a screening.
16 Months to 2 Years: Language Takes Off
Your child’s vocabulary and understanding are expanding every single day.
What You’ll See (by 18 months):
- Moves away from you but looks to make sure you’re close by
- Points to show you something interesting
- Puts hands out for you to wash them
- Looks at a few pages in a book with you
- Helps you dress them by pushing arm through sleeve or lifting foot
- Use of about 20 words
- Says “no” and responds to “no”
- Follows one-step directions without gestures (“sit down,” “give it to me”)
- Copies you doing chores (sweeping, dusting)
- Plays with toys in a simple way (pushing a car)
- Walks without holding onto anyone or anything
- Scribbles
- Drinks from a cup without a lid and may spill sometimes
- Feeds themselves with fingers
- Tries to use a spoon
- Climbs on and off a couch or chair without help
- Tantrums to be expected
What You’ll See (by 2 years):
- Notices when others are hurt or upset (shows concern)
- Looks at your face to see how to react in new situations
- Points to things in a book when you ask (“Where’s the bear?”)
- Says at least two words together (“more milk,” “no bed”)
- Points to at least two body parts when asked
- Uses more gestures than just waving and pointing (blowing a kiss, nodding yes)
- Holds something in one hand while using the other (holding container and taking off lid)
- Tries to use switches, knobs, or buttons
- Plays with more than one toy at the same time (putting toy food on a plate)
- Kicks a ball
- Runs
- Walks up a few stairs with or without help
- Eats with a spoon
What’s Happening Inside: Your child’s brain is making rapid connections between words and meanings, actions and consequences. The prefrontal cortex (responsible for planning and decision-making) is beginning to develop, allowing for more complex play and problem-solving.
What You Can Do:
- Have conversations throughout the day. Narrate what you’re doing
- Ask simple questions and wait for responses
- Read books and ask questions about the pictures
- Provide opportunities for pretend play
- Give your child safe spaces to run, climb, and explore
- Let them help with simple tasks (putting toys away, wiping spills)
- Sing songs and do finger plays together
- Name feelings (“You look happy!” “Are you feeling sad?”)
When to Be Concerned: If by 2 years your child doesn’t use two-word phrases (“want milk”), doesn’t know what familiar objects are for, doesn’t copy actions and words, doesn’t follow simple instructions, doesn’t walk steadily, or loses skills they once had, talk to your pediatrician immediately.
2 to 3 Years: Becoming Independent
Your child is developing a sense of self and asserting independence (hello, “terrible twos”-which are actually a sign of healthy development).
What You’ll See (by 30 months):
- Plays next to other children and sometimes plays with them
- Shows you what they can do by saying “look at me!”
- Follows simple routines when told (“It’s cleanup time”)
- Creative use of speech
- Says two or more words together with one action word (“doggie run”)
- Names things in a book when you point and ask
- Says words like “I,” “me,” or “we”
- Uses things to pretend (feeding a block to a doll as if it were food)
- Shows simple problem-solving skills (standing on stool to reach)
- Follows two-step instructions (“Get your coat and bring it to me”)
- Uses hands to twist things (turning doorknobs, unscrewing lids)
- Takes some clothes off by themselves (loose pants, open jacket)
- Jumps off the ground with two feet
- Turns book pages one at a time when you read
- Toilet training
What You’ll See (by 3 years):
- Calms within 10 minutes after you leave (at daycare drop-off)
- Notices other children and joins them to play
- Talks with you in conversation using at least two back-and-forth exchanges
- Asks “who,” “what,” “where,” or “why” questions
- Says first name when asked
- Talks well enough for others to understand most of the time
- Draws a circle when you show them how
- Avoids touching hot objects when warned
- Strings items together (large beads, macaroni)
- Puts on some clothes by themselves (loose pants, jacket)
- Uses a fork
- Cooperative play with peers
What’s Happening Inside: Your child’s brain is building executive function skills-the ability to plan, focus attention, remember instructions, and juggle multiple tasks. Social-emotional areas of the brain are developing, allowing for more complex interactions with peers. Language centers have exploded with growth.
What You Can Do:
- Encourage pretend play with simple props
- Ask open-ended questions (“What do you think will happen?”)
- Let your child make simple choices (“Do you want the red cup or the blue cup?”)
- Provide opportunities to play with other children
- Read longer stories and ask questions about the plot
- Let your child help with age-appropriate tasks
- Practice taking turns in games and conversation
- Name and validate emotions (“I see you’re frustrated. That’s okay.”)
When to Be Concerned: If by 3 years your child doesn’t make eye contact, doesn’t play pretend, doesn’t use three-word sentences, doesn’t follow simple instructions, drools constantly, or can’t work simple toys, request a comprehensive evaluation.
What to Do If You Have Concerns
Here’s what matters most: You know your child best. If something doesn’t feel right, trust that instinct.
Developmental milestones show what most children (at least 75%) can do by a certain age. But every child develops at their own pace. Missing one milestone doesn’t necessarily mean there’s a problem, but it does mean you should talk to your pediatrician.
Remember: The milestones you notice today shape the possibilities of tomorrow. Trust your instincts. Ask questions. Act early. Sign up for a free assessment from our Early Intervention program.
Act Early
If your child is not meeting one or more milestones, has lost skills they once had, or you have concerns:
- Talk with your child’s doctor immediately. Share your specific concerns and ask about developmental screening.
- Request a referral to a specialist who can evaluate your child more thoroughly.
- Contact your state’s early intervention program to find out if your child can get services to help. These services are available from birth to age 3 and can make an extraordinary difference.
- Don’t wait. The earlier intervention begins, the more effective it is. The first three years are the most rapid period of development in a person’s life and also when the brain is at its most flexible.
The Power of Early Intervention
When Brenda and Karen started Kids on the Move in a church basement with five families, they understood something critical: early intervention during these first 1,000 days can change the trajectory of a child’s entire life.
Among the factors that influence early brain development, three stand out as having particularly profound effects: reduction of toxic stress and inflammation, presence of strong social support and secure attachment, and provision of optimal nutrition.
But there’s a fourth factor: timely intervention when development isn’t progressing as expected.
You’re Not Alone
If you’re reading this and feeling worried about your child’s development, know this: seeking help is not admitting failure. It’s the bravest thing a parent can do.
Every family that walks through our doors at Kids on the Move is walking the same path Brenda and Karen walked. We see you. We’ve been there. And you’re not alone.
The first 1,000 days are not just a window of vulnerability, they’re a window of opportunity. An opportunity to notice, to act, and to build the foundation your child needs to thrive.
Because every child carries possibility. Every family deserves support. And when we notice the early signs and act on them, we don’t just change milestones-we change lives.