👶

Baby Cry Frequency Analyzer

Measure the pitch (fundamental frequency) of a cry in real time, with its range and a pitch-over-time trace. A simple, visual look at the sound of a cry — its highness or lowness — for curiosity and learning.

⚠ Educational / novelty only — this is NOT a medical or diagnostic tool. It measures the pitch of a sound; it does not tell you why a baby is crying, what they need, or anything about their health. Cry-"type" systems (like "Dunstan Baby Language") are not scientifically validated. If you are ever worried about your baby or their cry, contact a pediatrician or doctor — never rely on a web tool.

Microphone

Idle — press Start.

Current pitch

—Hz
Listening for a cry…

Pitch range (this session)

Lowest
—
Average
—
Highest
—
A typical infant cry sits around 400–600 Hz, often ranging from roughly 250 Hz up past 1000 Hz. The "band" simply describes whether the current pitch is lower or higher than that typical range — it says nothing about meaning or wellbeing.
Pitch over time — the cry’s melodic contour (last ~10 seconds)

What This Tool Does (and Doesn’t)

Please read first: this is an educational and novelty tool. It measures the pitch of whatever sound your microphone hears — nothing more. It cannot tell you whether a baby is hungry, tired, in pain, or unwell, and it makes no medical claims of any kind. If you have any concern about your baby’s crying, breathing, or health, contact a pediatrician, doctor, or emergency services — do not use this or any website for medical decisions.

What it actually does is pitch detection: it listens to the sound, finds the repeating pattern in the waveform (autocorrelation), and reports the fundamental frequency — how high or low the sound is. A baby’s cry is a strong, fairly tonal sound, so its pitch is easy to track. The tool plots that pitch over time as a contour and tracks the lowest, highest, and average pitch it has heard since you started.

Why pitch, and what’s "typical"?

Researchers who study infant cries usually report a fundamental frequency around 400–600 Hz, with plenty of variation between babies and moments (roughly 250 Hz to over 1000 Hz). This tool’s "lower / typical / higher" band is just a description of where the current pitch sits relative to that broad range. It is not a judgement about the baby — pitch varies naturally with age, effort, and individual difference.

About "baby cry translators"

Some apps and the "Dunstan Baby Language" system claim to classify cries into meanings (hunger, gas, etc.) from specific sounds. These claims are not supported by rigorous scientific evidence, and independent studies have not validated them. This tool deliberately does not attempt to interpret meaning — it only measures pitch, honestly.

Frequently Asked Questions

Can this tell me why my baby is crying?
No. It measures pitch only — the highness or lowness of the sound. It cannot determine hunger, pain, illness, or any need, and it isn’t a medical device. If you’re trying to understand or are worried about your baby’s crying, talk to a pediatrician.
Is a high-pitched cry a sign of a problem?
This tool can’t answer that, and you shouldn’t use it to. Cry pitch varies a lot between healthy babies and moments. Clinicians consider many factors together, not a single number from a phone mic. If something about your baby’s cry, behavior, or health worries you, contact a doctor — that is always the right call.
How does it measure the pitch?
It uses autocorrelation: it looks for the time delay at which the waveform best repeats itself. That delay is the period of the sound, and its reciprocal is the fundamental frequency (pitch). It only reports a pitch when the sound is loud and tonal enough to track reliably; otherwise it shows "listening."
Does it work on any sound or voice?
Yes — it’s really a general pitch tracker tuned for the cry range (about 150–1200 Hz). You can hum or sing into it and watch the pitch trace. It has no idea whether the sound is a baby; it just measures frequency.
Why does the pitch jump or drop out?
When the sound is quiet, noisy, or not clearly periodic (between cry bursts, or with overlapping sounds), there’s no reliable pitch to report, so the trace breaks. Strong, sustained cries track cleanly; whimpers and background noise don’t.
Is the "Dunstan Baby Language" real?
It’s a commercial system claiming five universal pre-cry "words." Independent scientific studies have not validated those claims. This tool intentionally avoids any such interpretation and only measures pitch.
Is the audio recorded or uploaded?
No. The microphone signal is analyzed in real time purely to estimate pitch; nothing is recorded, saved, or transmitted. The microphone is released when you press Stop or close the tab. (Still, please don’t rely on any website for decisions about a child’s wellbeing.)
Should I use this instead of seeing a doctor?
Absolutely not. This is a toy for curiosity and learning about sound. For anything concerning a baby’s health, crying, feeding, or breathing, consult a qualified medical professional.

Related Tools

Fundamental Frequency Finder
General pitch detection for any sound or voice.
Singing Range Detector
Map your lowest and highest singing notes.
Chromatic Tuner
Tune to the nearest note with cents accuracy.
Audio Spectrum Analyzer
Full FFT spectrum analyzer with peak hold.
Microphone Test
Check that your mic works: level, clipping, waveform.
Appliance Noise Identifier
Find the frequency of a hum, buzz or whine.
← All Microphone Diagnostics Tools