When should I worry about baby milestones?

Talk to your pediatrician if your baby shows no social smiling by 3 months, cannot hold their head steady by 4 months, does not reach for objects by 5 months, does not babble by 7 months, does not respond to their name by 9 months, or has no words by 16 months. Every baby develops at their own pace, but early intervention can make a significant difference.

When do babies start crawling?

Most babies begin crawling between 7 and 10 months, though some start as early as 6 months. Some babies skip crawling entirely and go straight to pulling up or cruising along furniture, which is perfectly normal. The key milestone is that they are finding ways to move independently.

When do babies say their first words?

Most babies say their first recognizable words around 12 months, typically simple words like 'mama' or 'dada.' Babbling with consonant sounds usually begins around 6-7 months, and by 9-10 months babies often use babbling that sounds like real conversation with varied tones and rhythms.

What are the most important milestones in the first year?

Key first-year milestones include social smiling (around 2 months), reaching for objects (3-4 months), sitting independently (5-7 months), crawling or moving independently (7-10 months), and first words and steps (around 12 months). Development spans four categories: physical, cognitive, sensory, and social-emotional, and each is equally important.

Development April 6, 2026 14 min read

Baby Development Milestones: Month-by-Month Guide (0-12 Months)

Q: What should my baby be doing at each month?

Baby milestones vary by month. At 1 month, babies can briefly lift their head during tummy time. By 3 months, most babies smile socially and track objects. By 6 months, many sit with support and begin babbling. By 9 months, most crawl and respond to their name. By 12 months, many take first steps and say 1-2 words.

Your baby's first year is packed with extraordinary growth. From that first wobbly head lift to tentative first steps, each month brings new abilities that build on the last. This guide walks you through what to expect month by month, organized across four key areas of development, so you can celebrate every win and know when to seek guidance.

Every baby develops on their own timeline. The milestones listed here represent typical ranges based on research from the American Academy of Pediatrics (AAP) and the CDC's developmental monitoring guidelines. Think of them as guideposts, not deadlines. Some babies crawl at 6 months; others skip crawling entirely and go straight to pulling up. Both paths are normal.

What matters most is that your baby is making steady progress and that you are engaging with them through play, conversation, and responsive caregiving. If you are looking for daily activity ideas tailored to your baby's exact age, the Little Play app delivers three science-backed activities every day.

Understanding the Four Areas of Baby Development

Pediatricians and developmental specialists evaluate infant progress across four interconnected categories. A strong foundation in one area often supports growth in the others, which is why varied, purposeful play is so valuable.

Baby development spans four interconnected categories that build on each other throughout the first year.

Physical / Motor: How your baby moves, from lifting their head to taking first steps. This includes both gross motor skills (large movements) and fine motor skills (using hands and fingers).
Cognitive: How your baby thinks, learns, and solves problems. This includes memory, understanding cause and effect, and early language development.
Sensory: How your baby processes information through sight, sound, touch, taste, and smell. Sensory play activities are one of the best ways to support this area.
Emotional / Social: How your baby connects with you and others, from first smiles to separation anxiety to early empathy.

Month-by-Month Baby Milestones: The Complete Timeline

Key milestones along your baby's first-year journey. Each baby reaches these at their own pace.

Newborn (0-1 Month): The Adjustment Period

Your newborn arrives equipped with remarkable reflexes - rooting, sucking, grasping, and the startle (Moro) reflex. These are not just cute; they are survival mechanisms that lay the groundwork for voluntary movement later on.

Physical

Moves head side to side while lying on back
Briefly lifts head during tummy time (start with 1-2 minutes)
Strong grasp reflex when you place a finger in their palm
Jerky, uncontrolled arm and leg movements

Cognitive & Sensory

Focuses on objects 8-12 inches away (the distance to your face during feeding)
Prefers high-contrast patterns in black, white, and red
Recognizes your voice and may turn toward it
Startles at loud sounds

Emotional & Social

Prefers looking at human faces above all else
Calms when held, rocked, or hearing your voice
Communicates needs through different cries

Activity tip: Hold your baby close and talk or sing to them during feeding. This distance is perfect for their vision and builds the attachment bond that supports all future development.

Our Pick

High Contrast Flashcards

Bold black-and-white patterns designed for newborn visual development. Perfect for those early weeks when baby's vision is just starting to focus.

Month 2: The First Social Smile

Around 6-8 weeks, most babies produce their first true social smile, one of the most rewarding milestones for parents. This is not a reflex; it is your baby intentionally responding to you.

Physical

Holds head up at 45 degrees during tummy time
Smoother, less jerky movements
Opens and closes hands

Cognitive & Sensory

Follows objects with eyes across midline
Begins cooing and making vowel sounds ("aaah," "oooh")
Shows preference for primary caregiver's voice

Emotional & Social

Social smiling in response to faces and voices
Briefly self-soothes (may suck on fist)
Makes eye contact for longer periods

Month 3: Growing Stronger

By three months, your baby's neck muscles are significantly stronger and they are becoming a much more engaged social partner. This is when interactive play really starts to take off.

Physical

Holds head steady when supported upright
Pushes up on forearms during tummy time
Bats at hanging toys with increasing accuracy
Bears some weight on legs when held standing

Cognitive & Sensory

Tracks objects smoothly in a 180-degree arc
Turns head toward sounds
Brings hands together at midline
Begins exploring objects with mouth

Emotional & Social

Smiles readily at familiar people
Enjoys back-and-forth "conversations" (you talk, baby coos)
May laugh or squeal with delight

Activity tip: Place colorful developmental toys just within reach during tummy time. The motivation to grab something interesting is one of the best drivers of motor development at this age.

Month 4: The Grabber

Month four is when your baby's hand-eye coordination makes a leap. They can now see something they want and reach for it with purpose, a crucial cognitive-motor connection.

Physical

Reaches for and grasps objects deliberately
Rolls from belly to back (some babies)
Holds head steady without support
Pushes up on hands during tummy time

Cognitive & Sensory

Explores objects by mouthing, shaking, and banging
Watches faces intently and studies expressions
Recognizes familiar objects (bottle, favorite toy)
Responds to their own name (beginning)

Emotional & Social

Laughs out loud
Initiates social interaction by cooing or smiling at you
May cry when play stops (wants more)

Our Pick

Skwish Rattle

Wood & elastic. Classic wooden rattle that squishes and always bounces back — perfect for practicing those new grasping skills.

Month 5: Rolling and Reaching

Your baby is getting genuinely mobile now. Rolling in both directions opens up a whole new world of exploration, and their growing strength means sitting is just around the corner.

Physical

Rolls in both directions (belly to back and back to belly)
Sits with support (tripod position with hands on floor)
Transfers objects from one hand to the other
Reaches for toys with one hand

Cognitive & Sensory

Interested in small details and patterns
Looks for dropped or partially hidden objects
Blows raspberries and experiments with sounds
Full color vision now developed

Emotional & Social

Shows distinct preferences for certain people
Expresses displeasure when a toy is taken away
Enjoys looking at self in mirror

Month 6: The Sitter

Six months is a landmark. Many babies can sit with minimal support, opening up both hands for play. This is also typically when solid foods are introduced, marking a major sensory and developmental shift.

Physical

Sits with little or no support
Rocks back and forth on hands and knees (pre-crawling)
Uses raking grasp to pick up small objects
Supports full weight on legs when held standing

Cognitive & Sensory

Begins to understand cause and effect (shakes rattle to make sound)
Babbles with consonant sounds ("ba," "da," "ma")
Shows curiosity about objects just out of reach
Responds to changes in tone of voice

Emotional & Social

Recognizes familiar vs. unfamiliar faces
Enjoys interactive games like peekaboo
May begin showing stranger wariness

Activity tip: Peekaboo is not just a game - it teaches object permanence, one of the most important cognitive milestones of the first year. Play it often and in different variations.

Month 7: The Independent Sitter

By seven months, sitting is usually secure, and your baby may be army crawling or scooting. Their babbling becomes more complex, with strings of sounds that start to resemble conversation.

Physical

Sits independently and pivots to reach toys
May begin crawling, scooting, or army crawling
Picks up small objects between thumb and fingers
Bangs objects together

Cognitive & Sensory

Babbles in longer chains ("babababa," "dadadada")
Looks for objects that fall out of sight
Explores textures and surfaces with hands and mouth
Understands the word "no" (may not obey it)

Emotional & Social

Shows clear attachment to primary caregivers
May experience separation anxiety (peaks around 8-10 months)
Enjoys social games and anticipation (e.g., "I'm gonna get you!")

Month 8: The Crawler

Crawling is a major milestone, but remember that some babies skip it entirely and that is perfectly fine. Whether they scoot, roll, bear-walk, or crawl traditionally, the key is that they are finding ways to move independently.

Physical

Crawls on hands and knees (or alternative movement)
Pulls to standing using furniture
Developing pincer grasp (thumb and forefinger)
Picks up and releases objects intentionally

Cognitive & Sensory

Explores containers (putting things in and taking them out)
Looks at correct picture when an object is named
Explores how things work (pushes buttons, turns knobs)

Emotional & Social

Separation anxiety may be strong
Plays interactive games (pat-a-cake, peekaboo)
Uses gestures to communicate (raises arms to be picked up)

Our Pick

Object Permanence Box

Solid wood Montessori toy where baby drops a ball and watches it reappear — the perfect way to explore this exciting new cognitive skill.

Month 9: The Communicator

Nine months is a key developmental check-in recommended by the AAP. Your baby is now combining movement, communication, and social skills in increasingly sophisticated ways.

Physical

Pulls to stand confidently
Cruises along furniture (walks while holding on)
Uses pincer grasp to pick up small foods
May stand briefly without support

Cognitive & Sensory

Understands several words ("mama," "dada," "bye-bye," "no")
Points at objects to show interest (joint attention)
Drops objects deliberately and watches them fall
Imitates sounds, gestures, and simple actions

Emotional & Social

Has clear favorite toys and people
May show fear of specific things (vacuum, loud noises)
Looks to your face for emotional cues (social referencing)

Activity tip: Point at things and name them throughout the day. "Look, a dog!" with a point teaches joint attention and builds vocabulary, even months before your baby speaks. A calming bedtime routine also supports the emotional regulation developing at this stage.

Month 10: The Explorer

At ten months, your baby's curiosity is insatiable. They are mobile, dexterous, and determined to investigate everything. Baby-proofing becomes essential as they open drawers, pull cords, and test every boundary.

Physical

Cruises confidently along furniture
May stand independently for a few seconds
Refined pincer grasp (picks up tiny items easily)
Stacks 1-2 blocks

Cognitive & Sensory

Understands simple instructions ("Give me the ball")
Imitates new gestures and sounds after seeing them once
Looks inside containers and behind barriers
May say "mama" or "dada" with meaning

Emotional & Social

Tests boundaries and watches your reaction
Shows a budding sense of humor
Enjoys parallel play near other babies

Month 11: Almost Walking

The anticipation builds as your baby stands alone for longer stretches and may take a few tentative steps. Their personality is unmistakable now, with clear preferences, opinions, and a growing sense of independence.

Physical

Stands alone for several seconds
May take first independent steps
Puts objects into containers with precision
Turns pages of a board book (several at a time)

Cognitive & Sensory

Follows simple one-step directions
Says 1-3 words besides "mama" and "dada"
Uses objects correctly (holds phone to ear, drinks from cup)

Emotional & Social

Waves bye-bye and claps hands
Seeks approval and may repeat actions that get a laugh
Shows empathy (may pat another crying baby)

Month 12: The First Birthday

Happy birthday! At one year old, your baby has transformed from a reflexive newborn into a walking, talking, thinking little person. The range of normal at this age is enormous, so celebrate wherever your baby is on this journey.

Physical

Walks with one hand held, or independently (typically between 9-15 months)
Picks up tiny objects with neat pincer grasp
May begin to scribble with crayons
Drinks from a cup with help

Cognitive & Sensory

Says 1-3 meaningful words
Understands 50+ words even if they cannot say them
Finds hidden objects easily (object permanence established)
Explores cause and effect with purpose

Emotional & Social

Has strong preferences and expresses them clearly
Shows affection to familiar people (hugs, kisses)
May show separation anxiety in new situations
Begins to cooperate with dressing (holds out arm)

Activity tip: At this age, the best thing you can do is follow your baby's lead. If they hand you a block, build with them. If they point at a bird, name it and watch together. This responsive interaction builds language, cognition, and emotional security all at once.

When to Talk to Your Pediatrician

Every baby develops at their own pace, and most variations are perfectly normal. However, the AAP and CDC recommend talking to your pediatrician if you notice any of the following. Early intervention services are available in every state and can make a significant difference when started early.

Based on CDC developmental monitoring milestones and AAP screening guidelines.

It is important to note that missing one milestone does not necessarily mean there is a problem. Pediatricians look at the overall pattern of development across all four categories. Premature babies, for example, should be measured against their adjusted age rather than their birth date for the first two years.

How to Support Your Baby's Development

The single best thing you can do for your baby's development requires no special equipment and costs nothing: responsive, engaged interaction. Research consistently shows that back-and-forth exchanges between parent and baby - what developmental scientists call "serve and return" interactions - build the brain architecture that supports all future learning.

Five Evidence-Based Ways to Support Development

Talk to your baby constantly. Narrate your day, describe what you see, and respond when they babble back. Babies who hear more language in their first year develop stronger vocabulary and communication skills.
Prioritize tummy time from day one. Start with a few minutes after each diaper change and gradually increase. Tummy time builds the core, neck, and shoulder strength needed for every physical milestone. Read our complete tummy time guide for age-specific tips.
Follow your baby's lead. When your baby stares at something, name it. When they reach for a toy, hand it to them and talk about it. This responsive approach teaches them that their actions matter and their curiosity is valued.
Offer varied sensory experiences. Different textures, sounds, smells, and visual patterns all stimulate brain development. Our sensory play activities guide has dozens of ideas organized by age.
Choose toys with purpose. The best developmental toys are often the simplest: stacking cups, soft blocks, board books, and rattles. Check our developmental toy guide for specific recommendations by age.

Frequently Asked Questions About Baby Milestones

What should my baby be doing at each month?

Development varies widely, but general patterns hold: by 2 months most babies smile socially, by 4 months they reach for objects, by 6 months they sit with support, by 9 months they crawl and babble, and by 12 months many take first steps and say 1-3 words. Use the month-by-month sections above for detailed breakdowns.

My baby is not crawling at 9 months. Should I worry?

Not necessarily. Some babies crawl as early as 6 months, while others do not crawl until 10-11 months. Some skip crawling entirely and go straight to pulling up and cruising. What matters is that your baby is finding a way to move and explore their environment. If your baby shows no interest in moving at all by 10 months, mention it to your pediatrician.

Do premature babies reach milestones later?

Yes, and this is expected. Use your baby's adjusted age (age since their due date, not their birth date) when tracking milestones for the first two years. A baby born two months early might reach the 4-month milestone around their 6-month birthday, and that is completely on track.

How can I track my baby's milestones?

The Little Play app provides daily science-backed activities matched to your baby's age, making it easy to support and observe development naturally through play. You can also download the CDC's free "Milestone Tracker" app or print checklists from your pediatrician's office.

Is screen time bad for baby development?

The AAP recommends no screen time for babies under 18 months, with the exception of video calls with family. Babies learn best through hands-on interaction with real people and real objects. If you want engaging, screen-free activities for your baby, the Little Play app delivers three new ideas daily.

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