Baby Milestones: Complete Month-by-Month Development Guide

From those first tiny smiles to wobbly first steps and exciting first words, baby milestones are the markers that help parents understand how their child is growing and developing. Tracking baby development milestones is not about comparing your child to others — it is about knowing what to look for, when to celebrate progress, and when to seek support if something seems off.

This comprehensive guide covers the key developmental milestones from birth through 24 months, organized month by month. We cover motor skills, cognitive development, social-emotional growth, and — because communication is the foundation of everything — we pay special attention to speech and language milestones at every stage.

The timelines below are based on guidelines from the Centers for Disease Control and Prevention (CDC), the American Academy of Pediatrics (AAP), and the American Speech-Language-Hearing Association (ASHA). Remember that every child develops at their own pace, and there is a wide range of what is considered typical at each age.

What Are Developmental Milestones?

Developmental milestones are specific skills or behaviors that most children can do by a certain age. They serve as checkpoints that help parents and pediatricians track a child's progress across four main areas:

• Gross motor skills: Large body movements like rolling, sitting, crawling, and walking.
• Fine motor skills: Smaller, more precise movements like grasping, pointing, and picking up small objects.
• Cognitive skills: Thinking, learning, problem-solving, and understanding how the world works.
• Communication and language: Understanding words (receptive language), producing sounds and words (expressive language), and social communication like eye contact and gestures.
• Social-emotional skills: Bonding, responding to others, expressing emotions, and developing a sense of self.

Missing one milestone in isolation is usually not a cause for concern. However, consistently falling behind across several areas or losing skills that were previously acquired (called regression) warrants a conversation with your pediatrician. For a deep dive into the communication side of development, see our complete speech and language milestones guide.

0 to 3 Months: The Newborn Stage

Motor Milestones

• Moves arms and legs actively when awake
• Brings hands to mouth
• Briefly lifts head during tummy time (by 1 month)
• Holds head steadier when supported upright (by 2 to 3 months)
• Opens and closes hands, begins to grasp objects placed in the palm

Cognitive Milestones

• Focuses on faces within 8 to 12 inches
• Tracks moving objects with eyes by 2 months
• Recognizes familiar people at a distance by 3 months
• Begins to show boredom if activity does not change (fussing, looking away)

Communication Milestones

• Startles at loud sounds (from birth)
• Calms or smiles when spoken to
• Begins cooing — making soft vowel sounds like "ooo" and "aaa" (around 2 to 3 months)
• Turns head toward sounds and voices
• Has different cries for different needs (hunger, discomfort, tiredness)
• Makes eye contact and watches faces during feeding and talking

Social-Emotional Milestones

• First social smile (around 6 to 8 weeks)
• Begins to self-soothe (sucking on hands)
• Shows preference for familiar caregivers

Red Flags at 0 to 3 Months

• Does not respond to loud sounds
• Does not watch things as they move
• Does not smile at people by 3 months
• Does not bring hands to mouth
• Cannot hold head up when pushing up on tummy

4 to 6 Months: Growing Awareness

Motor Milestones

• Rolls from tummy to back (around 4 months) and back to tummy (around 5 to 6 months)
• Pushes up on arms during tummy time
• Sits with support, and begins sitting independently by 6 months
• Reaches for and grasps toys with both hands
• Brings objects to mouth to explore

Cognitive Milestones

• Shows curiosity about things and tries to get out-of-reach objects
• Begins to pass objects from one hand to the other
• Explores objects by shaking, banging, and mouthing them
• Looks at objects that fall (beginning understanding of object permanence)

Communication Milestones

• Cooing transitions to vocal play — experimenting with pitch, volume, and squealing
• Responds to own name by turning or looking (by 5 to 6 months)
• Begins early babbling with consonant-vowel combinations ("ba," "da," "ma") by 6 months
• Laughs and giggles
• Makes sounds to express happiness and displeasure
• Takes turns making sounds with a caregiver (proto-conversations)

Social-Emotional Milestones

• Enjoys playing with people and may cry when play stops
• Responds to other people's emotions (smiles at a smiling face)
• Likes looking at self in a mirror

Red Flags at 4 to 6 Months

• Does not try to get things that are within reach
• Shows no affection for caregivers
• Does not respond to sounds or voices
• Does not make vowel sounds or early babbling
• Does not roll in either direction
• Seems unusually stiff or unusually floppy

7 to 9 Months: Exploring the World

Motor Milestones

• Sits independently without support
• Begins to crawl (some babies scoot, roll, or army-crawl instead — all are typical)
• Pulls to stand while holding onto furniture
• Uses a raking grasp transitioning to a pincer grasp (thumb and forefinger)
• Transfers objects between hands easily

Cognitive Milestones

• Looks for hidden objects (object permanence is developing)
• Explores cause and effect (drops a spoon, watches it fall, waits for you to pick it up)
• Plays peek-a-boo and enjoys simple turn-taking games
• Begins to understand that objects exist even when out of sight

Communication Milestones

• Babbling becomes more complex and varied ("bababa," "mamama," "dadada")
• Uses babbling that sounds like real speech with rising and falling intonation (called jargoning)
• Understands "no" and simple words in context (like "bottle," "bye-bye")
• Uses gestures: waving bye-bye, reaching arms up to be picked up
• Begins pointing at objects of interest (a critical pre-language skill)
• Responds to simple requests ("Come here," "Want more?")

Social-Emotional Milestones

• May show stranger anxiety or cling to familiar adults
• Has favorite toys
• Shows joint attention — looks at something, then looks at you to share the experience

Red Flags at 7 to 9 Months

• No babbling at all by 9 months
• Does not respond to own name
• Does not recognize familiar people
• Does not look where you point
• Does not bear weight on legs when held in a standing position
• Does not sit with help

If your baby is not babbling by 9 months, this is worth discussing with your pediatrician. Babbling is a key precursor to first words, and early intervention can make a significant difference when started early.

10 to 12 Months: On the Verge of Toddlerhood

Motor Milestones

• Cruises along furniture
• May take first independent steps (some children walk as early as 9 months, others not until 15 to 18 months)
• Uses pincer grasp to pick up small objects like cereal pieces
• Puts objects into and takes them out of containers
• Bangs two objects together

Cognitive Milestones

• Finds hidden objects easily
• Imitates actions like stirring a spoon or talking on a phone
• Begins to use objects correctly (drinks from a cup, brushes hair)
• Explores things in different ways (shaking, banging, throwing, dropping)

Communication Milestones

• May say first true words around 12 months ("mama," "dada," "ball," "dog," "more")
• Uses gestures alongside sounds to communicate (pointing and saying "da!")
• Understands 50 or more words even if they only say a few
• Follows simple one-step directions ("Give me the ball")
• Tries to imitate words you say
• Uses exclamations like "uh-oh!"

Social-Emotional Milestones

• Cries when parent leaves (separation anxiety peaks around 10 to 18 months)
• Shows preferences for certain people and toys
• Repeats actions that get a reaction (laughs, claps)
• Tests boundaries and watches your response

Red Flags at 10 to 12 Months

• No words or word approximations by 12 months
• No gestures such as pointing or waving by 12 months
• Does not search for things they see you hide
• Does not stand when supported
• Loss of any previously acquired skills

Learn more about what to expect and how to encourage those exciting first words in our guide on helping your baby say their first words.

13 to 18 Months: Early Toddlerhood

Motor Milestones

• Walks independently (most children walk between 12 and 15 months)
• Begins to climb on low furniture
• Stacks two to three blocks
• Scribbles with a crayon
• Turns pages of a board book (several at a time)

Cognitive Milestones

• Points to things of interest to share with others
• Knows what ordinary objects are for (phone, cup, brush)
• Points to one body part when asked
• Begins simple pretend play (pretends to feed a doll)

Communication Milestones

• Uses 3 to 20 words (pronunciation is often unclear, and that is completely normal)
• Vocabulary is growing steadily, with new words added every week
• Points to familiar objects when you name them ("Where is the dog?")
• Follows simple one-step directions ("Bring me your shoes")
• Shakes head "no" and nods "yes"
• Attempts to imitate new words frequently

Red Flags at 13 to 18 Months

• No words by 15 to 16 months
• Does not point to show you things or share interest
• Does not notice or respond when a caregiver leaves or returns
• Does not follow simple directions
• Not walking by 18 months

This is a wonderful age to start using interactive speech games as a playful supplement to daily routines. The Tiny Talkers app features vocabulary-building activities designed specifically for toddlers in this developmental window, turning everyday practice into an engaging game.

19 to 24 Months: The Language Explosion

Motor Milestones

• Runs (though still a bit unsteady)
• Kicks a ball
• Walks up stairs while holding on
• Stacks four to six blocks
• Begins to show hand dominance

Cognitive Milestones

• Sorts shapes and colors
• Completes simple puzzles (2 to 3 pieces)
• Follows two-step instructions ("Get your cup and put it on the table")
• Begins to play make-believe with increasing complexity
• Points to things in a book when named

Communication Milestones

• The vocabulary explosion typically occurs in this window — learning multiple new words per day
• Uses 50 or more words by 24 months
• Begins two-word combinations: "more milk," "daddy go," "big truck," "want cookie"
• Uses words more often than gestures to communicate
• Asks simple questions ("What that?" "Where go?")
• Familiar listeners understand about 50 percent of what they say
• Names items in a picture book ("dog," "car," "baby")

Social-Emotional Milestones

• Shows more independence ("Me do it!")
• Plays alongside other children (parallel play)
• Shows defiant behavior (a normal and healthy part of development)
• Imitates adults and older children

Red Flags at 19 to 24 Months

• Fewer than 50 words by 24 months
• No two-word combinations by 24 months
• Difficulty understanding simple questions or directions
• Prefers gestures over words when words should be emerging
• Regression — losing words or skills previously acquired
• Does not imitate actions or words
• Does not engage in pretend play

If your child has fewer than 50 words by age 2 or is not combining words, they may be a late talker. While many late talkers do catch up on their own, research shows that early intervention leads to better long-term outcomes. It is always better to have your child evaluated and find out everything is fine than to wait and see.

Speech Milestones vs. Language Milestones: What Is the Difference?

Parents often use "speech" and "language" interchangeably, but they refer to different things — and understanding the distinction matters when tracking your baby's development.

• Speech milestones relate to the physical production of sounds. This includes cooing, babbling, pronouncing consonants and vowels, and eventually saying words clearly enough to be understood. Speech is about the mechanics — how well the mouth, tongue, lips, and jaw work together to produce sounds.
• Language milestones relate to the ability to understand and use a system of communication. This includes receptive language (understanding what others say, following directions, responding to questions) and expressive language (using words, gestures, or signs to convey meaning, combining words into sentences, asking questions).

A child can have perfectly clear speech but delayed language (they pronounce words well but have a very limited vocabulary). Conversely, a child can have advanced language understanding but unclear speech (they know many words and follow complex directions but are hard to understand when they talk). For a detailed breakdown by age, visit our speech and language milestones guide.

When Should You Be Concerned About Late Milestones?

It is important to remember that developmental milestones represent averages, not deadlines. There is a normal range for achieving each skill, and some perfectly healthy children are simply on the later end of that range. However, certain patterns do warrant attention:

• Consistent delays across multiple areas. A child who is late in one area (for example, walking) but on track everywhere else is usually not a concern. A child who is late in motor skills, communication, and social interaction may benefit from evaluation.
• Regression at any age. If your child loses skills they previously had — stops babbling, stops waving, stops using words they once used — this is always a reason to contact your pediatrician promptly.
• Not meeting key communication checkpoints. No babbling by 9 months, no words by 16 months, no two-word phrases by 24 months, or no gestures (pointing, waving) by 12 months are all recognized red flags.
• Hearing concerns. Since hearing is the foundation of speech and language development, any signs of hearing difficulty (not responding to sounds, not turning toward voices, frequent ear infections) should be investigated.
• Your gut feeling. Parents know their children best. If something feels off, trust your instincts and ask for an evaluation. There is no downside to checking.

If you have concerns, you can request a free evaluation through your state's Early Intervention program for children under 3. You do not need a doctor's referral in most states. Learn more about speech therapy options and what to expect.

How to Encourage Baby Milestones Through Play

The best way to support your baby's development is through everyday interaction and play. You do not need expensive toys or structured lessons — you are your child's best teacher. Here are evidence-based strategies organized by developmental area:

For Motor Development

• Provide daily tummy time from birth (start with a few minutes and build up). This strengthens neck, shoulder, and core muscles needed for sitting, crawling, and walking.
• Offer age-appropriate toys that encourage reaching, grasping, and transferring between hands.
• Create safe spaces for crawling and cruising. Baby-proof a room and let them explore freely.
• Play with stacking blocks, shape sorters, and simple puzzles as they grow.

For Cognitive Development

• Play peek-a-boo to build understanding of object permanence.
• Hide toys under blankets and encourage your baby to find them.
• Provide cause-and-effect toys (press a button, something happens).
• Let your child explore safe household objects — pots, wooden spoons, and containers are endlessly fascinating.

For Communication and Language

• Narrate everything. "I am putting on your sock. This is your blue sock. Now the other foot!" Running commentary builds vocabulary and teaches sentence structure.
• Practice serve and return. When your baby coos or babbles, respond as if they said something meaningful. Pause and wait for them to "reply." This teaches the rhythm of conversation.
• Read together every day. Point to pictures, name objects, make animal sounds, and let your child turn the pages. Even very young babies benefit from hearing books read aloud.
• Sing songs and nursery rhymes. The repetition, rhythm, and melody in songs help babies learn the patterns of language.
• Offer choices. "Do you want the banana or the apple?" Hold up both items. Even before they can say the words, they will point or reach — and you label their choice for them.
• Expand on their words. If your toddler says "car," you say "Yes, a big red car! The car goes fast." This models richer language without correcting them.

For Social-Emotional Development

• Respond consistently to your baby's cries and needs. This builds secure attachment, which is the foundation for all healthy development.
• Play face-to-face games — making silly faces, copying their expressions, playing pat-a-cake.
• Provide opportunities for interaction with other children as they approach toddlerhood.
• Name emotions: "You seem frustrated! That toy is tricky." This builds emotional vocabulary.

For structured, age-appropriate activities that complement your daily play, explore the baby games and activities on Tiny Talkers. The app includes interactive speech and language games designed by child development specialists to support each stage of your baby's communication journey.

Frequently Asked Questions

At what age do babies start talking?

Most babies say their first recognizable words around 12 months, though the range is broad. Some babies say a word or two by 10 months, while others do not produce true words until 14 to 15 months. Before words come, babies communicate through cooing (2 to 3 months), babbling (6 to 9 months), gestures like pointing and waving (9 to 12 months), and jargoning — babbling that sounds like conversation. All of these are important infant milestones on the road to talking.

What are the most important baby milestones to track?

While all milestones matter, communication milestones are particularly important because they are connected to cognitive, social, and emotional development. Key ones to watch for include: social smile (by 2 months), cooing (by 3 months), babbling (by 6 to 9 months), responding to name (by 9 months), gestures like pointing and waving (by 12 months), first words (by 12 to 15 months), and two-word combinations (by 24 months).

Should I worry if my baby is not crawling?

Not necessarily. Some babies skip crawling entirely and go straight to pulling up and walking. Others scoot on their bottoms or army-crawl. The important thing is that your baby is finding ways to move and explore their environment. However, if your baby shows no interest in moving at all by 10 to 12 months, mention it to your pediatrician.

My baby is 18 months old and only says a few words. Is that normal?

At 18 months, most children have between 5 and 20 words, though some have more and some have fewer. What matters more than the exact word count is whether your child is: understanding many more words than they say, using gestures to communicate, adding new words over time (even slowly), and engaging socially. If your child has no words at all by 16 months or is not using gestures, it is a good idea to request a speech and language evaluation. Read more in our late talker guide.

Do premature babies hit milestones later?

Yes, and this is expected. Pediatricians use an "adjusted age" for premature babies, which is calculated based on their due date rather than their actual birth date. For example, a baby born 2 months early who is now 6 months old would be evaluated using milestones for a 4-month-old. Most premature babies catch up to their peers by age 2 to 3, though some may need additional support.

Can too much screen time delay baby milestones?

Research suggests that excessive passive screen time (watching videos without interaction) can be associated with language delays, especially in children under 2. The AAP recommends avoiding screen time for children under 18 months, except for video chatting. After 18 months, limited high-quality interactive content — such as speech therapy apps like Tiny Talkers that require active participation — can be a helpful supplement to real-world interaction. The key is that screen time should never replace face-to-face conversation, reading, and play.

When should I contact my pediatrician about milestones?

Contact your pediatrician if your child is consistently missing milestones across multiple areas, has lost skills they previously had, does not respond to sounds or their name, shows no interest in interacting with others, or if your instincts tell you something is not right. You can also request a free evaluation through your state's Early Intervention program without a doctor's referral. Early support leads to better outcomes — there is no benefit to "waiting and seeing" when concerns exist.

Key Takeaways

• Baby development milestones are helpful guideposts, not rigid deadlines. Every child develops at their own pace within a range of what is typical.
• Communication milestones — from cooing to babbling to first words to word combinations — are among the most important to track because they connect to all other areas of development.
• Key red flags include: no babbling by 9 months, no gestures by 12 months, no words by 16 months, no two-word phrases by 24 months, and any loss of previously acquired skills.
• Speech milestones (sound production) and language milestones (understanding and using communication) are related but distinct. A child can be delayed in one but not the other.
• The single most effective thing you can do to support your baby's development is to talk, read, sing, and play with them every day.
• If you have concerns, act early. Early intervention is free, effective, and available in every state for children under 3.

Content informed by CDC developmental milestone guidelines, AAP recommendations, and ASHA resources. For the most current developmental milestone information, visit CDC's "Learn the Signs. Act Early." program and asha.org.