Your baby's first word probably wasn't a word

Everybody remembers the first word. Very few families remember the first one that worked.

Before "mama" or "dada" or whatever gets written in the book, there is usually a period of several weeks in which your child has a sound that means something extremely specific — and only that. Not a word. A sound with a job.

How it actually goes

It's rarely the name of anything. It's usually a demand, or a discovery.

A particular noise that means up. A short syllable that means the dog, and only that dog. Something that means "the thing I want is on the counter." Half a word for the bath. A sound made only in the car.

The adults in the house learn these fast, and stop noticing them almost immediately, because a system that works becomes invisible. Within days everyone is fluent and nobody thinks it's remarkable that a nine-month-old has invented vocabulary and taught it to three adults.

"'Gah' meant the light switch. Only the light switch. For a month it was the most useful word in the house."

Why it disappears completely

Because it gets replaced, and replacement leaves no trace.

Real words arrive, do the same job better, and the invented ones drop out. There's no last day, no announcement. The sound just stops being used, and because it was never written down and never sounded like language, there's nothing left of it a year later — not in a video, not in the baby book, not in anyone's memory.

Then someone asks what their first word was, and you say "dada," because that's the one that made it into the record.

The bit that's worth catching

This is one of the few genuinely irreplaceable things in early childhood, and it lasts weeks.

• The sound, spelled however it sounds to you — nobody else's spelling matters
• What it means, precisely: not "food" but "the yoghurt in the fridge"
• Who understands it and who doesn't
• What they do with their hands or face while saying it
• Roughly when it started

A voice note is even better, and takes four seconds. It is the single most-regretted omission parents mention: not that they didn't film the first steps, but that they have no recording of the voice at that specific age. Voices change more completely than faces do, and there's no photograph of a sound.

The version they'll want later

When your child is nine, the story that lands isn't "your first word was dada." Every child has that story and it's the same story.

What lands is: for one month, when you were ten months old, you said "buh" and it meant the vacuum cleaner, and you said it every single time we opened the cupboard, and we all learned it without noticing.

That one is only theirs. But it exists only if somebody spent thirty seconds writing it down in the weeks it was true.