Thinkabara👶 Baby development, month by month
Every parent wonders at some point, “Is it okay that my baby isn’t… yet?” Here are common milestones from birth to age two in plain words, based on widely used public guidance such as the CDC’s “Learn the Signs. Act Early.” checklists and the American Academy of Pediatrics. Babies develop at their own pace: a milestone is a typical age range, not a test.
Birth to 3 months
The first months are about getting to know each other. Your baby learns your face and voice and starts to control their head.
Calms down when picked up or spoken to
Your voice and touch are their first source of safety.
Looks at faces
A familiar face up close is the most interesting thing in the world.
First smile
Around 2 months, many babies smile when you talk to them.
Makes sounds other than crying
Soft coos and gurgles start to show up.
Lifts head during tummy time
Only briefly at first, and a little stronger every day.
🧸 Play idea
Short tummy time several times a day while awake and with you, plus songs and face-to-face chatting during diaper changes.
4 to 6 months
Your baby becomes more social, laughs, and starts using their hands on purpose.
Laughs and smiles to get your attention
Social play has begun.
Takes turns making sounds with you
You coo, they coo back: the first conversations.
Reaches for and grabs a toy
Hands become tools.
Rolls from tummy to back
Often between 4 and 6 months.
Leans on hands when sitting with support
The muscles for sitting are getting ready.
🧸 Play idea
Hold a rattle just within reach and let them grab it. Read board books with big pictures.
7 to 9 months
Sitting, babbling and a new awareness of strangers.
Sits without support
Usually around 8–9 months.
Responds to their name
Turns when you call.
Babbles syllables like “ba-ba” and “ma-ma”
Not words yet, but practice for them.
Clingy or shy with new people
A normal sign of attachment.
Passes things from hand to hand and looks for a dropped toy
They know things still exist when out of sight.
🧸 Play idea
Peekaboo, and hiding a toy under a cloth while they watch.
10 to 12 months
Standing, waving and the first real words.
Pulls up to stand holding furniture
Cruising along the couch often follows.
Waves bye-bye
Gestures come before words.
Says “mama” or “dada” to the right person
Often around the first birthday.
Understands “no”
Even if they don’t always follow it.
Picks up small things with thumb and finger
The pincer grasp: keep small objects out of reach.
🧸 Play idea
Put toys in a container and take them out again, over and over.
13 to 18 months
Walking, pointing and copying everything you do.
First steps alone
Anywhere from about 9 to 18 months is common.
Tries to say a few words
Often 3 or more words besides mama and dada by 18 months.
Points to ask for something or to show you
An important communication step.
Copies everyday actions
Sweeping, talking on the phone, feeding a doll.
Scribbles and stacks two blocks
Fine motor skills are growing.
🧸 Play idea
Name everything you see on a walk, and let them help with simple chores.
19 to 24 months
Two-word sentences, running and big feelings.
Puts two words together
Like “more milk” or “daddy go”.
Points to body parts and to pictures in a book
Understanding is way ahead of speaking.
Runs and kicks a ball
Big movement all day long.
Eats with a spoon
Messy, but on their own.
Notices when someone is sad
Early empathy.
🧸 Play idea
Pretend play with a doll or teddy: feed it, bathe it, put it to bed.
Simple things that help at every age
Talk a lot
Describe what you’re doing: “Now we’re putting on your sock.”
Read books from the very start
Even a few minutes a day.
Give time for free movement
On the floor, not only in a seat or stroller.
Answer them
Respond to sounds, gestures and looks.
Don’t compare
Every child has their own pace.
When to ask your pediatrician
When you feel something isn’t right
You know your child best. It’s always okay to ask.
When your baby loses a skill they had
This is worth checking soon.
When several milestones are late
Bring it up at the next well-child visit, or call sooner.
Bring a list to the visit
Write down what you noticed and when.
This guide is general information, not medical advice. Every baby is different; your pediatrician knows your child.
Questions and answers
When do babies start smiling?
Many babies give their first social smile at around 2 months, when you talk to them or smile at them.
When do babies start walking?
Most babies take their first steps between about 9 and 18 months. Many walk on their own around their first birthday or a few months after.
My baby isn’t crawling yet. Is that okay?
Some babies skip crawling and scoot, roll or go straight to walking. What matters more is that they are moving and gaining new skills. If you are worried, ask your pediatrician.
How many words does a baby say at 1 year?
Around the first birthday, many babies say “mama” or “dada” for the right person and maybe one other word. Understanding is usually far ahead of speaking.
Who do I contact if I’m worried about a delay?
Start with your pediatrician. In the US, every state also has a free early intervention program for children under 3 (Part C of IDEA); you can contact it directly without a referral.