How loud is a NICU?

What the numbers mean

How it was measured. Hourly A-weighted Leq measured at infant head height, 50 to 80 cm from the head, in an open-bay NICU during quiet hours (Advances in Neonatal Care, 2025). The American Academy of Pediatrics recommends 45 dB or less.

Premature babies spend weeks in an environment of monitor alarms, ventilators, incubator fans and staff activity. In a 2025 study in Advances in Neonatal Care, Class 1 meters fixed to incubator drip stands at the infants' head height, 50 to 80 cm away, recorded A-weighted equivalent levels of 55 to 63 dB over 60-minute periods during quiet hours.

The American Academy of Pediatrics recommends that NICU noise stay at or below 45 dB. A 2025 Italian pilot study in Children found the average environmental level was consistently above 45 dB and that each 1 dB rise was associated with a higher chance of tachycardia in preterm newborns.

Short loud events rise well above these hourly averages, which is why the 2025 study also analysed L5, the level exceeded 5% of the time, to capture them.

Is it safe?

Below 85 dBA, the level NIOSH allows for a full 8-hour day. At this level, sound is not a hearing risk however long it lasts, though it can still disturb sleep or concentration.

Protecting your hearing

Parents can help by speaking softly, silencing phones and closing incubator portholes gently. Ask staff about the unit's quiet-hours routine.

Earplug and earmuff ratings (NRR in the US, SNR in the UK and EU) are lab figures; real-world protection is usually lower. How to read the ratings.

Compared with sounds nearby

Using midpoints of each range. Energy multiplies by 10 every 10 dB; perceived loudness roughly doubles (why).

• Hospital ward (50–60 dBA): this has about 2.5× its sound energy and sounds about 1.3× as loud.
• Classroom (35–77 dBA): this has about 2× its sound energy and sounds about 1.2× as loud.
• Dishwasher (38–85 dBA): it has about 1.8× the sound energy of this and sounds about 1.2× as loud.
• Electric car (warning sound) (50–75 dBA): it has about 2.2× the sound energy of this and sounds about 1.3× as loud.
• Normal conversation (55–70 dBA): conversation has about 2.2× the energy of this.

Questions

Sources

1. Neonatal Nurses' Perceptions and Objective Indices of Noise During Quiet Hours in the NICU, Advances in Neonatal Care. Supports: dB_low/dB_high: 55 to 63 dB Leq.The equivalent continuous sound level ( L eq ) ranged from 55 to 63 dB over 60-minute measurement periods.Checked 2026-11-02.
2. Neonatal Nurses' Perceptions and Objective Indices of Noise During Quiet Hours in the NICU, Advances in Neonatal Care. Supports: distance: 50 to 80 cm; A-weighted.maintained at a consistent distance of 50–80 cm from infants' headsChecked 2026-11-02.
3. Not a Quiet Place: Understanding Noise Level in a Newborn Intensive Care Unit (NICU) and Its Relation with Newborn's Vital Parameters, a Pilot Feasibility Study, Children. Supports: AAP 45 dB recommendation.The American Academy of Pediatrics recommends a maximum environmental noise level of 45 decibels (dB) or less in the NICU.Checked 2026-11-02.
4. Not a Quiet Place: Understanding Noise Level in a Newborn Intensive Care Unit (NICU) and Its Relation with Newborn's Vital Parameters, a Pilot Feasibility Study, Children. Supports: measured above 45 dB.The average environmental noise level was consistently above 45 dB.Checked 2026-11-02.

This page is general information, not medical advice. If you have ringing in your ears, muffled hearing or any change in your hearing, see an audiologist or your doctor.