Developmental Concerns to Discuss at 12 Months

First, how is a milestone different from a diagnosis?

Developmental milestones are examples of skills children may show as they grow, but milestone lists are not diagnostic tests. In England, the NHS offers a 9-to-12-month development review and uses the Ages and Stages Questionnaire to support a conversation about development.

A questionnaire or checklist helps families and health visitors notice what a baby is doing; it does not diagnose a condition. Share questions with your health visitor or GP.

So a 12-month-old not yet showing one listed skill does not, on its own, mean autism, a developmental delay, or another condition. Consider the child’s overall development and changes over time.

Which social interaction observations can you discuss?

At around 1 year, shared games such as a clapping game can be one everyday example of social interaction. The NHS 9-to-12-month review discusses areas such as language, learning, safety, diet, and behaviour.

If your baby rarely joins shared play or seems to respond very little to familiar people, you can mention what you observe to a health professional. A single day or unfamiliar setting is not enough to draw a conclusion; tiredness, illness, and surroundings can affect behaviour.

The aim is not to label your baby as social or unsocial, but to describe how back-and-forth interaction generally happens in daily life.

What might you notice about communication?

At around 1 year, families may notice gestures such as waving, sounds, and ways a baby responds during everyday interaction. No single example is a diagnosis; share a continuing concern with your health visitor or GP.

Not showing one of these skills is not a diagnosis. If your baby makes very few sounds, uses few gestures, and you have other communication concerns as well, share those observations.

Babbling, reaching, gestures, and responding to familiar people are examples of communication behaviours. A pattern across daily life is more useful than judging one skill on its own.

What examples relate to play and problem-solving?

Putting a toy in a container or looking for a toy you have hidden are examples of play and problem-solving that some babies show around this age.

There is no need to test these games repeatedly if your baby does not do them right away. Interest in the toy, tiredness, and the setting can affect what you see.

If exploring objects, noticing simple cause and effect, or looking for a hidden object seems very limited in everyday play, you can share that observation with a health professional.

What matters in movement development?

At around 1 year, some babies pull to stand or move while holding furniture; children vary in when they walk independently. A UK health visitor can discuss your baby’s movement as part of the 9-to-12-month review.

This distinction can prevent unnecessary worry. Not walking alone at 12 months is not, by itself, a red flag if your baby is pulling up, cruising, and continuing to develop movement skills.

Using one side much less, pain with weight-bearing, or a new, marked stiffness or floppiness is different from simply not walking alone and may need an individual assessment.

Why is losing a skill treated differently?

A skill not yet acquired is different from a skill your baby had and then lost. Tell your health visitor or GP promptly if you notice a clear loss of a communication, social, movement, or other developmental skill.

For example, a clear loss of a gesture, sound, or movement your baby used regularly should not be dismissed as simply being a little late.

Tell the health professional which skill changed and when you noticed it, whether it involves communication, social interaction, movement, or another area.

How do prematurity and individual differences affect milestones?

If your baby was born prematurely, the NHS calculates developmental age from the original due date rather than the birth date until age 2. Ask your health visitor how to interpret development for your baby.

Babies do not gain every skill in the same order or on the same day. One may progress quickly in movement while another develops communication or fine-motor skills earlier.

Rather than treating development as a race with peers, look at your baby’s progress over time and how different areas are developing together.

What can you do today?

Write a few short notes about what your baby has been doing recently in social interaction, communication, play, and movement.

Observe behaviours that arise naturally in everyday life instead of repeatedly testing one skill.

Share concerns across more than one area—or any loss of a previously acquired skill—with your child’s health professional.

Take your questions to the 9-to-12-month review with your health visitor, or contact your GP or health visitor sooner if your baby has lost a skill they had already gained.