The normal range for talking is wider than the milestone charts imply

This works through speech development in the order the parts actually depend on each other.

Understanding comes first

Children typically understand far more than they can say, and the gap between the two is widest in the toddler years. A child who follows instructions, points at named objects and responds to their name is demonstrating the underlying language system even with very few spoken words. This is why "she understands everything" is genuinely useful information, and why professionals ask about it before they ask for a word count.

It is also why counting spoken words is a poor summary of where a child actually is.

Gesture is part of language

Pointing to share attention, holding objects up to show you, waving and head-shaking are communicative acts that reliably precede speech. A child with a rich gestural repertoire and few words is in a different position from a child with neither. Reduced pointing and reduced interest in sharing attention are among the signals professionals take most seriously.

Watching what a child does, rather than only what they say, gives a far better picture.

Conversation builds it; volume alone does not

The strongest associations in the language research are with back-and-forth turns rather than with the sheer quantity of words a child hears. Treating a babble as a contribution, waiting, then responding again is the actual mechanism. Narrating what you are doing works because it attaches words to visible things, not because talking is inherently improving.

When it is going badly, background audio, including a television left on, does not do this and can make speech harder to pick out.

Bilingual homes are not a delay

Growing up with more than one language does not cause language disorder, and the evidence on this is consistent. Vocabulary in each separate language may be smaller for a period while the combined total is comparable. Mixing languages within a sentence is skilled behaviour rather than confusion, and adult bilinguals do it constantly.

Speaking to a child in the language you are most fluent and expressive in generally beats switching to a weaker one for their benefit.

The variation is genuinely enormous

First words and first sentences arrive across a wide window, and a family history of late talking is common among children who catch up entirely. Milestone charts describe averages and ranges rather than deadlines, and the published ranges themselves differ between health services. Comparing with a cousin or a nursery peer produces anxiety without producing information.

In practice, the direction of travel, whether new words keep arriving, tells you more than the count on any given day.

When to seek an assessment

Losing words or skills that were previously there is the signal that always warrants prompt attention, whatever the age. Little response to name, limited eye contact, no pointing, or no words by the age your health service flags are all reasons to ask. Repeated ear infections and glue ear affect hearing and therefore speech, which is why a hearing check is usually the first step.

Waiting to see is the common instinct, and speech and language services generally advise the opposite, because early assessment costs little.

The takeaway

Watch understanding, gesture and direction of travel, and ask early rather than waiting to see.

Most of parenting is repair, not perfection, and repair counts.