Most babies begin turning their heads toward familiar sounds around 1 month old, though the full ability to locate and turn toward new sounds develops over the first 6 months of life. This isn’t a single milestone but a gradual progression, starting with reflexive startles at birth and building toward deliberate, purposeful head turns as the brain learns to process what it hears.
Hearing Starts Before Birth
Babies don’t wait until birth to start hearing. The auditory system begins picking up sound around 23 to 24 weeks of pregnancy, when fetuses first show startle responses to vibrations. By 25 to 27 weeks, they respond to low-frequency tones, and by 29 to 31 weeks, they can detect higher-pitched sounds as well. By 28 to 30 weeks, all fetuses show consistent responses to sound stimulation.
This prenatal exposure has real consequences. Newborns already recognize their mother’s voice at birth and will work harder to hear it over an unfamiliar woman’s voice. That head start means the turning-to-sound milestone doesn’t emerge from nothing. Your baby has been listening for weeks before you ever see a response.
Month-by-Month Sound Response Timeline
Here’s what to expect as your baby’s hearing responses develop during the first year:
- Birth to 1 month: Newborns react to loud sounds with a startle reflex, throwing their arms out and pulling them back. They may be awakened by loud voices. These reactions are automatic, not intentional.
- Around 1 month: Babies start recognizing familiar sounds and may turn their head toward a parent’s voice. This is the earliest version of “turning to sound,” though it’s inconsistent and limited to voices they already know.
- 3 months: Babies recognize and calm to a parent’s voice. They may respond to familiar sounds with visible excitement or go quiet to listen. They also begin reacting to changes in tone of voice and the word “no.”
- 6 months: This is the big milestone. Babies reliably turn their eyes or head toward new, unfamiliar sounds. They respond to their own name and start repeating sounds they hear. The shift from reacting only to familiar voices to locating any new sound source marks a significant leap in auditory processing.
- 12 months: Babies respond to their name consistently, imitate words, make babbling sounds, and may say a few words like “mama” or “bye-bye.”
The transition from startling (a reflex) to turning (a choice) is the key change. Startling is the brainstem doing its job automatically. Turning toward a sound requires the brain to figure out where the sound came from and then coordinate head and eye movement to find it. That takes months of practice.
From Startle to Search
Newborns arrive with the Moro reflex, an involuntary response to sudden loud noises where the arms fling outward and the baby may cry. This reflex fades over the first few months as the brain matures. In its place, you’ll see increasingly deliberate behavior: eyes widening, head turning, body stilling to listen.
At 1 month, a baby turning toward your voice is still partly reflexive and heavily dependent on familiarity. They’re not locating a random sound in space. They’re responding to a pattern they’ve already memorized. By 3 months, they start sorting sounds more actively, showing clear preferences and emotional responses. By 6 months, the localization ability is genuinely spatial. If you clap behind them or shake a rattle to one side, a 6-month-old will turn to find it.
Why Sound Responses Matter for Speech
Turning toward sound isn’t just a cute party trick. It’s a critical building block for language. Babies who hear normally begin canonical babbling (repeating consonant-vowel combinations like “bababa” or “dadada”) between 5 and 10 months of age. Infants with significant hearing loss typically don’t reach this stage until well past 11 months, and often not until around 27 months even with hearing aids.
Interestingly, babies with hearing loss don’t vocalize less than other babies. They make just as many sounds overall. The difference is in the quality and structure of those sounds. Without auditory feedback from the world around them, their babbling doesn’t develop the rhythmic, speech-like patterns that lead to first words. Even after they begin babbling, they take longer to stabilize and build on it compared to babies with typical hearing. Early detection makes a meaningful difference in closing that gap.
How to Observe Your Baby’s Hearing at Home
You don’t need special equipment to get a sense of how your baby responds to sound. What you’re looking for changes with age. In the first few weeks, watch for startle responses to sudden loud noises, like a door slamming or a dog barking. Notice whether loud sounds wake your baby from sleep.
Around 3 months, try speaking to your baby from slightly off to one side while they’re calm and alert. A baby with typical hearing will turn toward your voice or at least quiet down to listen. By 6 months, you can try introducing a new sound, like shaking keys or clapping, from behind or to the side. Your baby should turn their eyes or head to locate it. By 9 to 10 months, saying your baby’s name from across the room should get a clear response.
Keep in mind that tired, hungry, or overstimulated babies may not respond even with perfect hearing. Try these observations when your baby is calm, fed, and alert. One missed response isn’t cause for concern. A consistent pattern of no response is worth bringing up with your pediatrician.
Signs That Hearing May Need Evaluation
Every newborn in the United States should receive a hearing screening before leaving the hospital, or by 1 month of age for babies born at home or in birthing centers. If a baby doesn’t pass the initial screen, rescreening and diagnostic testing with a pediatric audiologist should be completed by 3 months. If hearing loss is confirmed, intervention ideally begins by 6 months.
Even if your baby passed the newborn screening, hearing loss can develop later. Watch for these patterns:
- Birth to 3 months: No startle response to loud sounds, not turning toward your voice, not waking to loud noises
- 3 to 6 months: No response to new sounds, no reaction to changes in your tone of voice, not beginning to vocalize
- 6 to 10 months: Not responding to their name, not understanding common words like “mama” or “bottle,” not babbling
- 10 to 15 months: Not pointing at familiar objects when named, not using any single words meaningfully
Temporary hearing loss from ear infections is common in babies and can mimic some of these signs. Whether the cause is temporary or permanent, a pediatric audiologist can sort it out and recommend next steps.