Baby monitor RF exposure
Last reviewed: 19 October 2026
A baby monitor is one of the few transmitters that runs for hours right next to a sleeping child, which is why crib distance matters more for this device than for almost any other in the home. This page collects what monitors transmit, the power caps they ship under, and what the dated sources conclude.
Typical levels and limits, with dated sources
- Monitors come in three radio families: analogue audio transmitters that send continuously at very low power; digital audio monitors (mostly DECT), capped at 250 mW peak transmit power (ETSI EN 300 175); and Wi-Fi video monitors, which transmit in bursts under the same 100 mW EIRP cap that applies to 2.4 GHz WLAN equipment in the EU (ETSI EN 300 328).
- The ICNIRP general-public reference levels are frequency-dependent: f/200 W/m² between 400 MHz and 2 GHz (about 9.5 W/m² at DECT's 1.9 GHz) and 10 W/m² above 2 GHz, covering both Wi-Fi bands — all orders of magnitude above the power density a nursery monitor produces at a metre (ICNIRP, 2020).
- The WHO states that, considering the very low exposure levels and the research collected to date, there is no convincing scientific evidence that the weak RF signals from base stations and wireless technologies cause adverse health effects (WHO, "Electromagnetic fields and public health: base stations and wireless technologies", Fact sheet No. 304, 2006).
- IARC classified radiofrequency electromagnetic fields — the kind all baby monitor radios use — as "possibly carcinogenic" (Group 2B) in 2011, based on limited evidence (Baan et al., Lancet Oncology 12(7): 624–626, 2011; IARC Monographs Vol. 102).
How crib distance changes exposure
- RF power density falls with the square of distance from the transmitter: doubling the distance from the crib leaves roughly a quarter of it. Placing the camera or audio unit on a dresser a couple of metres away, instead of clipped to the cot, is the single biggest lever.
- Voice- and motion-activated modes cut the transmit time as well as the power: an idle monitor sends far less than one streaming continuously.
- The parent unit is a separate transmitter — it belongs wherever the carers are, not in the crib.
Sources
- ICNIRP (2020), "Guidelines for limiting exposure to electromagnetic fields (100 kHz to 300 GHz)", Health Physics 118(5): 483–524.
- ETSI EN 300 175 (DECT), "Digital Enhanced Cordless Telecommunications (DECT); Common interface" (250 mW peak power cap); ETSI EN 300 328 (100 mW EIRP limit for 2.4 GHz WLAN).
- WHO (2006), "Electromagnetic fields and public health: base stations and wireless technologies", Fact sheet No. 304, May 2006.
- Baan et al., IARC Working Group (2011), "Carcinogenicity of radiofrequency electromagnetic fields", The Lancet Oncology 12(7): 624–626; IARC Monographs Vol. 102.
Educational information, not medical advice. Numbers above are limits and findings as stated by their dated sources; our calculator's output is a model-based estimate, not a measurement. No adverse health effects are confirmed below international limits, and research on long-term effects is ongoing — see About for our editorial position.