Your baby’s first year comes with plenty of moments that make you stop and wonder: Is this new? Should they be doing that yet? When will they roll, sit, crawl, wave, or say their first word?
Milestone guides can help you understand what development often looks like during this first year. They are not deadlines, though, and they are definitely not rankings. Your baby may reach one skill earlier than expected and take more time with another. That variation is part of normal development.
Use this guide as a reference for what you may notice from birth through 12 months, while remembering that your pediatrician is the right person to talk with if you have concerns about your child’s development.
What Is a Developmental Milestone?
A developmental milestone is a skill or behavior that most children can do by a certain age. The Centers for Disease Control and Prevention (CDC) defines its milestones as things 75% or more of children can do by the specified age.
Milestones generally fall into several areas of development, including:
- Social and emotional skills
- Language and communication
- Thinking and problem-solving
- Movement and physical development
These areas develop together, but not necessarily at the same speed. Your baby might be very interested in moving while taking more time with sounds, for example. Another baby may babble constantly before showing much interest in getting across the room.
The CDC’s milestone checklists are also not the same as formal developmental screening. The American Academy of Pediatrics recommends ongoing developmental surveillance during well-child visits and standardized developmental screening at specific ages, including 9 months.
If your baby was born more than three weeks early, the CDC recommends using corrected age when reviewing milestone checklists. Your pediatrician can help you understand how corrected age applies to your child.
Baby Milestones From Birth Through 3 Months
The first few months are largely about adjusting, connecting, and gaining control over a body that is still very new to your baby.
Newborn
A newborn’s movements are still heavily influenced by reflexes. Head control is limited, and much of the day revolves around eating, sleeping, crying, and being comforted.
Even at this early stage, your baby is taking in a surprising amount of information. You may notice them becoming still when they hear your voice, looking closely at your face when you hold them nearby, or reacting to sounds and changes in light.
There is no need to turn these first weeks into an activity schedule. Holding your baby, talking to them, responding when they cry, and giving them supervised tummy time when they are awake all provide meaningful experiences.
1 Month
Around 1 month, your baby may begin spending slightly longer periods awake and alert. Movements can gradually become smoother, although they are still far from coordinated.
You may notice your baby:
- Watching your face
- Reacting to familiar voices
- Bringing their hands closer to their face or mouth
- Moving their arms and legs more actively
- Becoming increasingly interested in what is happening nearby
At this point, development can be subtle. A milestone does not have to be dramatic to matter.
2 Months
Two months is one of the CDC’s official milestone checkpoints.
By this age, most babies are beginning to become more socially responsive. You may notice your baby:
- Looking at your face
- Smiling when you talk or smile at them
- Making sounds other than crying
- Reacting to loud sounds
- Watching you as you move
- Holding their head up during tummy time
- Moving both arms and legs
This is also a good time for plenty of face-to-face interaction. Talking, singing, reading, cuddling, and supervised tummy time give your baby opportunities to practice social, language, and physical skills without turning play into a lesson plan.
3 Months
There is no official CDC 3-month milestone checklist, so it is more useful to think about this month as part of a broader developmental period.
Your baby may be gaining better control of their head and upper body, opening their hands more often, reaching or swiping toward interesting objects, and becoming more expressive.
You may also hear more cooing or see increasingly enthusiastic smiles when you interact. Some of these changes appear earlier or later. Babies are not known for carefully following calendars.
Baby Milestones From 4 Through 6 Months
Between 4 and 6 months, your baby often becomes noticeably more interactive. Toys become more interesting, sounds become more varied, and movement becomes increasingly purposeful.
4 Months
At the CDC’s 4-month checkpoint, you may notice your baby:
- Smiling to get your attention
- Chuckling
- Making cooing sounds
- Making sounds back when you talk
- Turning toward the sound of your voice
- Looking at their hands with interest
- Holding their head steady
- Holding or swinging toward toys
- Pushing up onto their elbows or forearms during tummy time
Your baby is beginning to discover that their actions can affect what happens around them. A sound can get your attention. A hand can reach a toy. A smile may earn another smile.
Those small discoveries are important parts of learning.
5 Months
Five months falls between the CDC’s formal 4- and 6-month checkpoints, so avoid thinking of it as a deadline for a particular skill.
Around this period, your baby may be working on:
- Reaching more accurately
- Grabbing and holding objects
- Rolling
- Improving head and trunk control
- Sitting with support
- Exploring objects with their hands and mouth
- Becoming increasingly expressive with sounds and facial expressions
The American Academy of Pediatrics discusses rolling, reaching, sitting, and related movement skills across a broader 4-to-7-month period. That is more realistic than expecting every baby to complete a particular movement during one specific month.
6 Months
By 6 months, many babies are eager participants in what is happening around them. CDC milestones at this age include:
- Recognizing familiar people
- Laughing
- Taking turns making sounds with you
- Reaching for toys they want
- Putting objects in their mouth to explore them
- Rolling from tummy to back
- Pushing up with straight arms while on their tummy
- Leaning on their hands for support while sitting
You may also notice your baby becoming more determined. The toy that was simply interesting a few months ago may now be something they actively try to reach.
Giving your baby safe time on the floor can provide room to experiment with these developing skills.
Baby Milestones From 7 Through 9 Months
Movement and exploration often become much more noticeable during the second half of the first year. Once babies figure out that the world extends beyond whatever is within arm’s reach, things get interesting quickly.
7 Months
Around 7 months, your baby may be sitting with less support or independently for periods of time. Their hands are also becoming more useful tools.
You may see them:
- Transfer toys between their hands
- Reach more deliberately
- Explore objects by turning, shaking, or mouthing them
- Sit with increasing stability
- Become increasingly interested in reaching things that are farther away
- Respond enthusiastically to familiar voices and faces
Your baby’s preferred way of moving may also begin to emerge.
8 Months
Some babies are already highly mobile around this age. Others remain perfectly content sitting and observing.
You may see rolling, belly movement, scooting, creeping, rocking on hands and knees, or early crawling. Your baby may also become increasingly interested in getting to a toy instead of waiting for someone to hand it to them.
Does Every Baby Have to Crawl?
No.
Crawling is a common part of infancy, but babies do not all move in the same way. Some crawl on their hands and knees. Others scoot, creep along their stomachs, roll to where they want to go, or use another movement pattern.
Some babies do very little traditional crawling before moving toward standing and walking.
That makes crawling a particularly good reminder that a milestone guide describes common development, not one mandatory sequence every child must follow.
9 Months
Nine months is another CDC milestone checkpoint and also an age when the American Academy of Pediatrics recommends standardized developmental screening.
By this age, CDC milestones include:
- Looking when you call their name
- Showing a reaction when you leave
- Smiling or laughing during games such as peekaboo
- Making repeated sounds such as “mamamama” or “babababa”
- Looking for an object that falls out of sight
- Banging two objects together
- Moving objects from one hand to the other
- Getting into a sitting position
- Sitting without support
You may also notice more opinions. Your baby may clearly prefer certain toys, people, foods, or activities and become increasingly effective at communicating those preferences.
Baby Milestones From 10 Through 12 Months
As the first birthday approaches, your baby may begin using movement, gestures, sounds, and problem-solving skills much more intentionally.
10 Months
Around 10 months, many babies are focused on getting where they want to go and reaching what interests them.
You might notice:
- More deliberate movement around the room
- Greater interest in cause and effect
- Imitating sounds, expressions, or simple actions
- Using gestures to communicate
- More precise use of their fingers
- Trying different ways to reach a desired object
You do not need to encourage your baby to rush toward standing or walking. Safe opportunities to move, explore, and practice are enough.
11 Months
At 11 months, your baby may be combining skills that have been developing for several months.
Some babies begin pulling up frequently or moving along furniture while holding on. Others remain more interested in crawling or sitting.
You may also see:
- More purposeful gestures
- Increasing understanding of familiar words
- Attempts to imitate what you do
- Greater independence during everyday routines
- More varied babbling
- Early attempts at meaningful words
A baby who is not walking at 11 months is not automatically behind. Independent walking has a wide developmental range.
12 Months
At 1 year, the CDC looks for milestones across social, communication, cognitive, and physical development. Common 12-month milestones include:
- Playing interactive games with you
- Waving goodbye
- Calling a parent “mama,” “dada,” or another special name
- Understanding “no”
- Looking for an object you hide
- Putting objects into containers
- Pulling up to stand
- Walking while holding onto furniture
- Picking up small items between the thumb and finger
One detail is especially worth noting: walking independently is not required by your child’s first birthday. First birthdays have enough pressure already. Walking does not need to become part of it.
Does Reaching Milestones Early Mean Your Baby Is Ahead?
It is surprisingly easy to turn milestones into a comparison game.
Your friend’s baby rolled first. Your nephew crawled months earlier. Someone at playgroup says their 10-month-old already has several words. Suddenly, instead of noticing what your baby is learning, you are wondering whether they are “behind.”
Earlier is not automatically better.
Development does not happen in one straight, evenly paced line. Your baby may spend a great deal of energy mastering movement while another child seems more interested in sounds and communication. The pattern can shift again a few months later.
That does not mean milestones are meaningless. They are useful reference points because they help you observe how your child’s development is progressing over time. The goal is to notice growth.
When Should You Talk With Your Pediatrician About Milestones?
Variation is expected, but there are still times when asking your pediatrician is wise. The CDC recommends talking with your child’s doctor if your child:
- Is not meeting one or more expected milestones
- Loses a skill they previously had
- Has other developmental changes that concern you
You also do not need to wait until you are certain something is wrong before bringing it up.
If you keep noticing something that concerns you, mention it. Your pediatrician can consider your child’s full developmental picture, medical history, corrected age when relevant, and other factors that a milestone chart cannot.
Milestone guides are useful tools. They are not diagnostic tools.
Everyday Experiences Help Babies Practice New Skills
Your baby does not need a packed schedule of developmental activities to learn. Many of the experiences that support development are remarkably ordinary:
- Hearing you talk and sing
- Looking at books together
- Having you respond to their sounds and expressions
- Spending supervised time moving on the floor
- Reaching for safe toys
- Exploring different textures
- Following familiar routines
- Getting plenty of face-to-face interaction
Babies learn through repetition, relationships, movement, and exploration. Much of that happens in small moments you may not even think of as “learning.”
How Daycare Can Support Your Baby’s Development
When your baby spends part of the day in daycare, that environment becomes another place where these everyday developmental experiences can happen.
At Celebree School, infant care focuses on creating a safe, responsive environment where your child can build secure relationships, experience predictable routines, and explore at a developmentally appropriate pace.
Teachers observe your child’s development during ordinary routines, interactions, and play. Those observations help them understand what your child is working on and provide experiences that meet them where they are instead of expecting every baby to follow exactly the same timeline.
That philosophy matters because babies do not need to be pushed toward the next milestone. They need opportunities to practice, adults who pay attention, and room to develop as themselves.
The first year changes quickly. One week your baby may seem perfectly content lying on a blanket. Before long, they are reaching, rolling, babbling, sitting, scooting, pulling up, or finding an entirely different way to keep you on your toes.
Milestones can help you understand those changes. Just remember to use them for what they are meant to be: useful guideposts along your child’s development, not finish lines they need to cross before anyone else.