The first time many parents see their premature baby is through the wall of an incubator, with monitors beeping and ventilator cycles humming behind them. It is not a setting that anyone associates with music. And yet over the last fifteen years, music therapy has become one of the most carefully studied interventions in neonatal care — and parents are increasingly being invited to take part in it.
The questions worth asking are simple: does it actually do anything, what does the research show, and how do you keep some version of it going once you go home.
Healthbooq supports families through the early months, and the lullaby and visualisation library in the Muna app is built with the gentleness that NICU graduates and their parents specifically need.
Why Music in the NICU Is Not Just Comforting
A baby born before 32 weeks has a nervous system that is not ready for the world it has arrived in. In the womb the soundscape is filtered — your voice and heartbeat dominate, high frequencies are damped out, sudden noise does not happen. The NICU sounds nothing like that. Sound levels at the head of the incubator commonly reach 70–90 dB from monitor alarms, ventilators, and conversation, and every blood test, diaper change, or tube adjustment lands on a system that has not finished wiring its own autonomic regulation.
Music therapy, in this context, is not "playing something soothing." It is a structured intervention, almost always delivered by a trained neonatal music therapist (in the United States typically certified through the NICU-MT program at Florida State; in Europe through Nordoff Robbins or comparable training routes). The therapist matches volume, tempo, and timbre to whatever the baby's body is doing in that moment, watches the monitors, and pulls back the second heart rate or oxygen saturation moves the wrong way.
Why it works is not particularly mysterious. Slow, vocally led music with a steady pulse promotes parasympathetic activation, supports a more regular breathing pattern, and helps mask harsher acoustic events on the unit. The harder part is showing those effects in a controlled trial.
The Loewy Pediatrics Trial (2013)
The trial that shifted the field was published in Pediatrics in May 2013 by Joanne Loewy and colleagues at the Louis Armstrong Center for Music and Medicine at Mount Sinai Beth Israel. It enrolled 272 premature infants of 32 weeks gestation or older across 11 NICUs in the United States, randomising them between standard care and three forms of live music therapy: a "Gato Box" (a wooden percussion instrument used to mimic intra-uterine rhythmic sounds), an "ocean disc" (used to simulate filtered amniotic fluid sounds), and live lullaby singing — typically the parent's preferred song, sung live by a therapist or by a coached parent.
What they found:
- Heart rate decreased significantly during and after live music sessions, with lullaby singing producing the largest reduction.
- Oxygen saturation improved during and after the ocean disc and lullaby interventions.
- Sucking behaviour and quiet-alert state improved with the Gato Box, suggesting better feeding readiness.
- Sleep quality, measured by behavioural state, improved with the ocean disc.
- Parents who participated in the lullaby intervention reported significantly less stress on validated stress scales.
The Loewy trial is not the last word — sample sizes per intervention were modest, outcomes were short-term — but it is the most cited piece of evidence in the field and the reason live music therapy is now a standard offering in many tertiary NICUs.
Haslbeck and Creative Music Therapy
Friederike Haslbeck's work in Switzerland, beginning around 2012 and continuing through more recent neuroimaging studies, used a different model: creative music therapy. Instead of a scripted lullaby, the therapist improvises in response to the infant's vocalisations, breathing pattern, and movements — the therapist is essentially in dialogue with the baby.
Outcomes documented across her group and follow-on European work include reduced episodes of apnoea and bradycardia, higher heart rate variability (a marker of better autonomic balance), improved weight gain trajectory in some cohorts, and — in a 2020 fMRI paper — measurable differences in resting-state brain network connectivity in preterm infants who received music therapy compared to those who did not. The neuroimaging evidence is early, but it is the most direct biological signal published so far.
What Outcomes the Literature Actually Tracks
Across the music-therapy NICU literature, the outcomes that turn up most consistently are:
- Heart rate (lower and more stable during and after music) and heart rate variability (higher).
- Oxygen saturation (higher, fewer desaturation episodes).
- Apnoea and bradycardia frequency (reduced).
- Behavioural state (more time quiet-alert or in quiet sleep, less time fussy or agitated).
- Feeding readiness and sucking strength (improved, particularly with the Gato Box used before feeds).
- Length of hospital stay (mixed — some studies show modest reductions, others none).
- Weight gain (small increases in some studies, particularly when music is paired with kangaroo care).
- Parent stress, anxiety, and depression scales (consistently reduced when parents are part of the music intervention).
The strongest signal is for the immediate physiological and behavioural outcomes. The harder outcomes — length of stay, long-term development — have less consistent evidence, though the neuroimaging work is suggestive.
Live vs. Recorded — What the Evidence Says
The instinct that live music must work better than a recording turns out to be right, at least for the high-stakes physiological responses. Live music is responsive: the therapist or parent slows down when the baby's heart rate climbs, pauses when saturation drops, matches the baby's breathing pattern. A recording cannot do that.
The 2016 Cochrane review by Bieleninik and colleagues, and the systematic reviews that followed, conclude that live music delivered by trained therapists shows stronger effects than recorded music — but recorded music still produces measurable benefits over no music at all, particularly when the volume is controlled (typically below 65 dB at the head of the incubator) and the recordings are chosen for the population (slow tempo, vocal lead, no sudden dynamic changes).
In practice, modern NICUs use both: live music therapy sessions delivered weekly or several times a week, supplemented by carefully chosen recorded music between sessions and during settling.
What Parents Can Do on the Unit
If your unit does not have a music therapist — many smaller units do not — there is still a real role for you. Your voice, near the incubator opening or during kangaroo care, delivers something no recording can match: the specific voice your baby has been hearing for months, with the developmental and bonding effects that brings. Choose one or two songs and stick to them. The same lullaby every time you arrive becomes a recognisable signal of your presence — and that consistency does more than variety.
A few practical points:
Volume. Keep it quiet. The general guidance is that the bedside should not exceed 45 dB on a continuous basis, with peaks no greater than 65 dB. If the baby is in an open cot rather than an incubator, your normal speaking voice at about 30 cm is usually appropriate; for an incubator infant, sing slightly more softly than feels natural.
Watch the monitors. If heart rate climbs, oxygen saturation drops, or the baby grimaces and turns away, stop and let them recover. The point of music in the NICU is to support regulation, not to add to the sensory load.
Time it deliberately. Before a feed, after a stressful procedure, during kangaroo care, at the start of quiet time on the unit — those are the moments where music does the most work.
Ask the unit. Many NICUs have a music therapist or a play specialist with training in this area, and most welcome a parent's involvement.
Continuing at Home
Discharge from the NICU is often, paradoxically, more anxious than the unit itself. The continuous monitoring is gone. The competent staff are gone. You are now alone with a small, fragile baby who you have come to know mostly through monitor numbers.
Continuing the music elements of the NICU experience at home gives you something familiar to do that you already know works.
Use the same songs you used on the unit, especially during settling and feeding. Continuity of musical environment is one of the few aspects of NICU life that you can preserve at home, and it helps with the transition.
Combine music with kangaroo care. Skin-to-skin contact paired with slow lullaby music is a well-evidenced combination — it reproduces, in part, the intra-uterine sensory environment and supports thermoregulation, breastfeeding, and bonding all at once.
Use a curated lullaby app rather than a generic playlist. Apps that curate for sleep — including Muna — pre-filter for the slow tempos, instrumental focus, and gentle dynamics that NICU graduates need. This matters more for premature infants than for full-term babies, who are far more tolerant of variable input. The kaleidoscope visualisation is for the parent, not the baby — it gives you something steady to look at while you do the work of holding still.
Keep the volume low. Premature babies are still on a developmentally adjusted timeline; their auditory system is more easily overstimulated than a same-age full-term baby's. Ambient music at 40–50 dB is usually appropriate; sleep music below 50 dB and ideally closer to 40 dB.
Watch for the same signs you watched on the unit. Premature graduates often signal overstimulation early — averted gaze, splayed fingers, hiccups, colour change — and the response stays the same: reduce input, hold still, let them recover.
Music will not fix the experience of a NICU stay, and it will not erase the trauma for a parent who has been through one. But for many families it becomes one of the few continuous threads from incubator to home — and a way of doing something visibly, repeatedly, calmly, that supports the slow project of regulation that the next year is built on.
Key Takeaways
Music in the NICU is not background sound — it is one of the better-studied non-drug interventions in neonatal care. The 2013 Loewy trial in Pediatrics, run across 11 NICUs, showed live music shifted heart rate, oxygen saturation, sucking, sleep, and parent stress in measurable ways. Haslbeck's Swiss work added similar physiological signals and, by 2020, the first fMRI evidence of changes in brain network connectivity. Live, individualised music delivered by trained therapists is the most powerful version; carefully chosen recorded music helps too. The most useful thing parents can do — both in the unit and at home — is sing one or two songs, consistently, at a quiet volume, while watching the baby's cues.
