There is a moment, somewhere around the middle of pregnancy, when a soft melody drifts through the air and something remarkable happens on the other side of a mother’s belly. The foetus, still months away from meeting the world, has already begun to listen. Music during pregnancy has long been treated as a sentimental ritual — a mother humming a lullaby to her bump, or a family playing classical music through a speaker in the nursery-to-be. But the science behind what the foetus actually hears, how it responds, and what those experiences may mean for development is far more compelling than folklore.

This article explores the growing body of research on prenatal hearing and music, walking you through the developmental timeline of the foetal auditory system, what studies have revealed about foetal memory and brain responses to sound, and the meaningful difference between singing and simply pressing play. It also bridges the journey from the womb to early childhood — because what begins before birth is only the opening note of a much longer, richer musical story.

The Womb Is Not a Silent Place

One of the most surprising things expectant parents learn is just how noisy the womb actually is. Far from being a hushed, padded retreat, the intrauterine environment is filled with a constant, layered soundscape. The primary causes of internal murmurs are cardiovascular, respiratory, and intestinal in origin — produced by the rhythmic beating of the mother’s heart, her breathing movements, and the activity of her digestive system. Together, they create a complex soundscape that surrounds the foetus as part of its ongoing auditory experience. This is the acoustic world a baby is born into, long before it ever hears a voice from outside.

Understanding this baseline is important because it means the foetal auditory system is not passively waiting for birth to begin its work. It is actively processing, filtering, and responding to sound from surprisingly early in pregnancy. The sounds of the mother’s body — particularly her heartbeat and voice — become deeply familiar anchors for the developing baby, and this familiarity carries real significance for bonding, language, and learning after birth.

When Can a Foetus Actually Hear Music?

Hearing does not arrive all at once. The foetal auditory system develops in stages, and each stage opens up a slightly richer world of sound. Around the 18th week of pregnancy, the foetus’s inner ear structures, including the cochlea, begin forming. While the physical anatomy of the ear is developing, true hearing is not yet possible because the auditory pathways in the brain are still forming. These initial structures start preparing the baby’s system to eventually perceive vibrations, primarily from internal sounds such as the mother’s heartbeat and digestion.

External sound begins to reach the foetus meaningfully from around week 23 to 24. At about 24 weeks, the foetus can begin to detect some external sounds, though they are muffled by the amniotic fluid. At this stage, a foetus may startle at loud noises or respond to familiar voices, which could cause changes in movement or heart rate. But for music specifically, the picture becomes clearer later in the second trimester and into the third. At 19 weeks, foetuses first respond to a 500 Hz tone, roughly the pitch of a man speaking in a normal conversational voice. By 27 weeks, 96% of foetuses respond to tones at 250 Hz and 500 Hz, which covers the range of most speech sounds. But at that same age, none respond to 1,000 Hz or 3,000 Hz tones — the higher pitches found in birdsong or the upper range of a woman’s singing voice.

Responsiveness to those higher frequencies fills in later. All foetuses respond to 1,000 Hz tones by 33 weeks and to 3,000 Hz tones by 35 weeks. So while a baby in the womb can hear voices and music well before the third trimester, it takes until the final weeks of pregnancy for the full range of hearing to come together. This is why the third trimester is often considered the richest period for sharing music with your unborn baby — not because earlier moments don’t matter, but because the auditory system is, by that point, most capable of taking it all in.

How the Foetus Responds to Music

Ask any parent who has played music near their pregnant belly and they will likely tell you: the baby moved. What feels like an anecdotal observation turns out to be entirely consistent with what researchers find in controlled studies. Foetuses are not passive audiences. Partial foetal hearing maturity is reached between 24 and 27 weeks of gestational age, and at this stage of foetal development, the foetus is able to perceive the acoustic parameters of speech, such as melody, rhythm, prosody, phonemes, and different tones.

When music filters into the womb, the foetus registers it in measurable ways. Heart rates change, movement patterns shift, and the baby demonstrates responsiveness that scientists can observe and document. Research investigated foetal responses to music played with a headset placed on the maternal abdomen and found an increase in foetal motor activity and in foetal heart rate in the foetus from 28 weeks. Interestingly, researchers studying an entire lullaby — rather than isolated tones — found evidence that babies begin paying noticeably more attention to music at around 33 weeks gestation. By that point, the foetal brain is not simply detecting noise; it appears to be engaging with the contour and pattern of what it hears.

Does the Foetus Remember Music? What the Research Shows

Perhaps the most fascinating question in this field is not whether foetuses can hear music, but whether they can remember it. The evidence strongly suggests they can. In one landmark line of research, babies whose mothers had regularly watched a particular television programme during pregnancy were tested as newborns with the show’s theme song. These babies showed a distinctive calming response — their heart rates slowed and they became more alert — when they heard the familiar tune. Babies who had not been exposed to it in utero showed no such reaction. The response was not present in either group when unfamiliar music was played instead.

In a controlled experimental setting, researchers created a unique piano melody and asked pregnant women to play it twice daily to their foetuses, beginning at 35 weeks. The music stopped before birth and was not played again until four weeks after the babies were born. When the infants heard the melody in a laboratory, their heart rate response was dramatically stronger than that of babies in a control group who had not heard it prenatally. There is converging evidence for foetal retention of auditory experience into early postnatal life, and this particular study illustrated just how lasting that retention can be — a melody heard in the womb, then silenced, was still recognisable a full month after birth.

In another controlled study, pregnant women listened to a keyboard rendition of “Twinkle, Twinkle, Little Star” once a day, five times a week, starting at 29 weeks — with some infants hearing the tune anywhere between 138 and 192 times before birth. When tested as newborns, neurophysiological studies using event-related potentials (ERP) revealed greater neural activation to lullabies heard during pregnancy, confirming that the prenatal brain was not only absorbing the music but encoding it in memory structures that persisted well after birth.

Music, the Brain, and Neural Plasticity Before Birth

One of the reasons prenatal music experiences carry such developmental weight is the extraordinary neural plasticity of the third trimester. During the last trimester of gestation, plasticity shapes the foetal brain, and sound is one of the primary channels through which that shaping occurs. The auditory cortex is not simply waiting for birth; it is being actively sculpted by every sound that enters the womb, and the quality and variety of that sound environment matters.

Research suggests a paramount influence of exposure to sound during prenatal neural plasticity windows, moulding auditory processing and perception since gestation. This growing body of evidence points to a very early form of auditory learning that takes place in utero, shaping the infant’s future neurodevelopment and processing of language. These are not abstract effects — researchers can measure them directly using neuroimaging and brainwave monitoring on newborns within hours of birth, detecting clear differences between babies who had rich prenatal sound environments and those who did not.

Prenatal music stimulation has shown positive effects on foetus, newborn, and pregnant mother, while postnatal exposure affected the neurodevelopment of preterm infants and parental interaction. The implications span beyond music appreciation — they touch on cognition, emotional regulation, and the foundations of social development.

The Surprising Link Between Prenatal Music and Language Development

One of the most exciting and underreported findings in this field is the connection between prenatal music exposure and a baby’s capacity to process language. A 2023 study published in the journal Developmental Science shed new light on this link. The study reveals that daily exposure to music during the last trimester of pregnancy is associated with more robust coding of speech stimuli. Prenatal exposure to music is associated with fine-tuned coding of the fundamental frequency of human speech, which may facilitate processing and early language acquisition.

This is a significant finding because it suggests that music is not operating in a separate developmental lane from language — the two are deeply intertwined. Certain brain regions are already active in the prenatal stage and can react to auditory stimuli, especially speech. This indicates that the brain of the foetus is already prepared for language processing before birth. The development of primordial linguistic networks is a basic element for later language processing, and the prenatal environment and exposure to language play an important role in the development of the brain in relation to language processing. Music, with its patterns of rhythm, pitch, and timing, appears to train the very neural pathways that will later be recruited for understanding and producing speech.

According to research conclusions, daily musical exposure during the last weeks of pregnancy is associated with an improved encoding of low-frequency sound compounds, which could improve the newborn’s perception of tone. For parents thinking about language-rich early childhood environments — whether English, Mandarin, or both — this connection between prenatal music and early language encoding is a compelling reason to make music a natural part of daily life long before a due date arrives.

Singing vs. Recorded Music: Which Is Better for Your Baby?

It is tempting, in an age of curated playlists and smart speakers, to treat prenatal music exposure as simply a matter of hitting play on the right soundtrack. But researchers and clinicians consistently highlight an important distinction: a mother’s own voice, especially when singing, offers something that a recording simply cannot replicate.

Hearing is fully developed around 24 to 26 weeks gestation and the first voice heard by a foetus is usually that of its mother, a voice that becomes a comforting anchor, particularly in times of distress. This innate draw to a mother’s voice is supported by research showing that newborns prefer the sound of their mother’s voice, and more so when that voice is singing. When a mother sings, the foetus receives not only the sound waves transmitted through the air but also the vibrations conducted through her body — a physical, intimate channel of communication that recorded music cannot provide.

There is mounting research showing the health benefits of singing among expectant mothers. Such benefits include improving maternal emotional state, reducing cortisol (the stress hormone), and increasing oxytocin (the bonding hormone). These benefits flow directly to the baby as well, since maternal stress levels during pregnancy are closely linked to foetal wellbeing. Singing appears to outperform simply playing recorded music when it comes to bonding, likely because singing engages the mother emotionally and produces vibrations the foetus feels directly. None of this is to say that recorded music has no value — it clearly does, particularly for its effects on maternal relaxation and as a source of rich, varied musical input. But singing is the more powerful of the two tools, and the good news is that it requires nothing more than a willingness to hum a tune.

Safe and Sensible Practices for Sharing Music During Pregnancy

The evidence in favour of music during pregnancy is encouraging, but it comes with some important caveats that every parent should understand. The goal is to enrich the foetal sound environment — not to overwhelm it. Experts are consistent in their guidance on what to avoid:

• Do not place headphones, earphones, or any sound device directly against the pregnant belly.No headphone or sound device should be applied directly to the abdomen during pregnancy, as this can result in damage to the foetal hearing system (hair cells in the cochlea) and hearing loss.
• Avoid sustained loud, low-frequency sounds.Scientists advise that exposure to intense low-frequency noise above 60 dB should be avoided during pregnancy, especially after 20 weeks.
• Avoid environments where noise levels threaten your own hearing. If a sound environment is too loud for the mother, it is too loud for the foetus.
• Fill the room naturally. The safest and most effective approach is to simply let music fill the space around you — through speakers at comfortable volumes — as part of everyday life.

The overarching principle is this: music during pregnancy should feel natural, enjoyable, and calm. Sing while you cook. Put on a favourite album in the background. Hum while you take a walk. Talking, reading, and singing to the foetus by the mother during pregnancy can help in developing better bonding and attachment, good hearing functions, and possible speech and language development in the coming years. The best prenatal music programme is one that fits seamlessly into a mother’s daily rhythm, rather than feeling like a structured academic exercise.

From the Womb to the World: Continuing the Musical Journey After Birth

Birth is not the end of this story — it is the moment the story truly opens up. Everything the foetus heard and encoded in the womb becomes the foundation from which a newborn begins to engage with the world. During the first months of life, an infant’s brain is absorbing the sounds around them. By the end of the first year, the brain starts to prioritise, building greater sensitivity to familiar sounds and less ability to distinguish unfamiliar ones. Based on phonetic perception and brain development research, regular exposure to a variety of musical sounds is critical during the first year of life.

Listening to music helps babies differentiate between different pitches, rhythms, and tones, which are foundational elements of speech and language. Research highlights that infants who engage with music through activities like singing, listening, and moving to rhythms show advanced abilities in language acquisition and cognitive development compared to those who do not have such musical interactions. This is why the transition from prenatal music appreciation to structured music enrichment in infancy and toddlerhood is such a natural and valuable one.

For families in Singapore looking to continue nurturing their baby’s musical development after birth, The Music Scientist’s programmes are designed around exactly this developmental arc. Tenderfeet supports the earliest stage of infant development through sensory-rich musical experiences that speak directly to what a baby’s brain has been primed for since the womb. As babies grow into toddlers, Happyfeet and Groovers extend that journey through movement, rhythm, and play, building the motor, cognitive, and social skills that early music research consistently points to as outcomes of rich auditory environments. For older toddlers beginning to explore their curiosity about the world, Scouts weaves science and music together in a way that makes learning irresistible. And when school readiness becomes the focus, the SMART-START English and SMART-START Chinese programmes channel music as a powerful medium for early literacy, memory, and confident learning.

The science of prenatal music is ultimately a story about continuity. The baby who responded to a lullaby in the womb and the toddler who lights up during a music class are connected by the same developmental thread. Music, it turns out, has been part of the learning journey from the very beginning.

What the Research Really Tells Us

The science is clear on several points: the foetal auditory system becomes meaningfully active from around 24 weeks, develops rapidly through the third trimester, and is capable of not just detecting but remembering music encountered before birth. Prenatal music exposure has been linked to stronger neural responses to both music and speech in newborns, and there is compelling emerging evidence connecting it to improved language encoding in the earliest days of life. Singing — especially a mother’s own voice — appears to be the most powerful form of prenatal musical engagement, outperforming recorded music on both bonding and physiological grounds.

What the research does not tell us is that prenatal music exposure guarantees smarter or more advanced children. The honest picture is more nuanced and, in some ways, more beautiful: music during pregnancy is less about optimization and more about connection. It is about beginning a conversation with your child before they are born, laying down neural pathways that will serve language, learning, and emotional development, and establishing a musical familiarity that will make the world feel a little more known from the very first breath.