15-Month Developmental Milestones

How should you read a 15-month milestone list?

CDC defines its milestones as skills that most children—at least 75%—can do by a certain age. The list is not a demand that every child show every skill on the same day.

Milestones offer clues about how a child plays, learns, communicates, and moves. CDC says its checklist does not replace a standardized, validated developmental screening tool.

A child may not yet show one item. One missing skill does not diagnose a condition; consider the broader pattern and how new skills develop over time.

What social and emotional skills may appear?

At 15 months, CDC lists copying other children during play, showing you a favorite object, and clapping when excited as examples.

A child may hug a doll or show affection with cuddles or kisses. Children do not need to show all these behaviors in the same way or with equal frequency.

One child may watch quietly while another approaches people readily. Temperament can shape social behavior and is not a diagnosis.

What communication skills may you notice?

CDC lists trying to say one or two words besides “mama” or “dada” by 15 months. The attempts do not need to sound like adult speech.

Looking towards a familiar object when you name it is an example of understanding language. For instance, a child may look at a ball when you ask where it is.

A child may follow a simple direction that includes both a gesture and words, such as handing over a toy when you hold out your hand and ask.

Why is pointing useful to notice?

CDC includes pointing to ask for something or get help on the 15-month checklist.

Pointing can serve different purposes, from requesting an object to drawing attention to something. Shared attention continues to develop and should not be judged from one moment alone.

When your child points, name what they see, answer briefly, and follow their gaze. This supports a natural back-and-forth.

What may play and problem-solving look like?

CDC lists trying to use familiar objects as intended—such as a cup, phone, or book—as a 15-month cognitive milestone.

Stacking at least two small objects is another example on the list. It may happen with blocks or other safe objects.

Imitation is also part of learning. A child may watch another child take toys from a container and then try the same action.

What movement skills may be emerging?

CDC lists taking a few steps independently by 15 months. A child may take a few steps, sit down, and then return to holding furniture rather than walking a long distance.

A new walker may use a wide stance, wobble, or fall often. The aim is not perfect walking, but opportunities to practise movement safely.

Using fingers to feed themselves some food is also on the CDC movement checklist at this age.

When is it helpful to talk with a doctor?

Not yet showing one milestone does not by itself diagnose a developmental condition. Share a persistent concern, especially if you have questions across more than one area of development.

A clear loss of a skill a child had previously gained is a separate reason to contact their doctor promptly. This could involve a word, gesture, or movement.

Your ongoing concern matters even if a checklist seems reassuring. Everyday observations help your child’s clinician decide whether screening or further assessment is appropriate.

What can you do today?

Rather than testing your child, notice how they communicate, move, and play during ordinary routines.

Name things your child points to, and use simple one-step directions in natural situations.

Offer a safe space to practise steps and play simple imitation games.

If your child clearly loses a skill they had already gained, contact their doctor.