Pregnancy

Your Baby Has Known Your Voice Since 25 Weeks: The Science of Talking to Your Bump

For the mum who feels faintly ridiculous chatting to her own stomach in the queue at Tesco: keep going. The hearing starts earlier than most people think, your voice is the one your baby hears best, and the introductions began months before the birth.

By Katie Manson  ·  5 min read

Somewhere around week 25 of pregnancy, your baby starts eavesdropping. The ears have been forming for months, tuned first to the muffled orchestra inside you: your heartbeat, your breathing, lunch making its way through. But from roughly the middle of the second trimester, sounds from the outside world start getting through too, and one voice arrives differently from all the others. Yours does not just travel through the air. It is carried through your body, down through bone and fluid, so your baby gets it in stereo. No other voice in the world reaches them that way.

What your baby can hear, and when

By around 24 to 26 weeks, many babies startle or shift in response to sounds from outside the bump, and from then on the soundtrack only gets richer. In the third trimester your baby is not just hearing your voice but learning it: its rhythm, its melody, the rise and fall of the way you in particular talk. Researchers have shown that newborns prefer their mother's voice within hours of birth, will work harder, measured by how they suck on a dummy in the studies, to hear it, and even recognise specific stories and songs they heard repeatedly from inside the womb. Babies are born crying in the melody of their mother's language. They arrive mid-conversation.

You are not new to each other. You never were.

This is why a brand new baby, seconds old and furious about the eviction, can settle at a single sentence from their mum. It is not magic and it is not coincidence. It is recognition.

Why your voice beats any playlist

You do not need the classical music playlists, the bump headphones or any of the kit that promises a cleverer baby. The evidence, summarised in the NHS evidence review on talking to your baby in the womb, points somewhere much cheaper: an ordinary voice, doing ordinary things, repeatedly. Language development starts before birth, and the voice your baby learns from most is the one attached to the body they live in. Speech and language teams across the NHS now actively encourage talking to the bump for exactly this reason. Your running commentary is the enrichment programme.

How to talk to a bump without feeling daft

Nobody stands in the kitchen delivering a speech to their waistband. The trick is to narrate what is already happening. Read the shopping list out loud. Explain to the bump, in full, why the bins have to go out tonight and whose turn it actually was. Sing badly in the car. Let your partner get their face close and talk too, since familiar voices at close range also get learned, even if yours will always have the home advantage. And if you pick one book or one song and repeat it through the third trimester, you are quietly building a settling tool for the newborn weeks: the familiar thing, from the familiar voice, at 3am when nothing else is working. A repeated song before bed has a habit of surviving birth and becoming the first family ritual, years before anyone realises that is what it was.

The NHS week-by-week pregnancy guide tracks what is developing when, if you like knowing exactly who is listening in at each stage. Spoiler: from the second trimester onwards, everything you say may be taken down and used to adore you later.

If you did not talk to your bump much, or pregnancy was too hard, too sick or too anxious for chat, none of this is a guilt stick. Babies learn voices at speed on the outside too, and yours becomes theirs within days. All newborns in the UK are offered a hearing screening in their first weeks; if you have any concerns about your baby's hearing or your own wellbeing in pregnancy, your midwife or health visitor is the first call.