Baby monitors are one of the most common devices parents ask us about, and it makes sense: this is a transmitter that runs all night, every night, near a sleeping infant. The good news is that the exposure question has practical, low-effort answers — and they mostly come down to which kind of monitor and where you put it.
The three kinds of monitors, from an EMF standpoint
- DECT digital monitors (most modern audio/video monitors, ~1.9 GHz): clear range and good sound — but many models transmit continuously, even when the room is silent. A monitor that never stops talking is the main thing to know about.
- Wi-Fi / app-based monitors: these stream video to your phone, which means continuous transmission by design, plus your router is involved. Convenient, but from a pure exposure standpoint they're in the always-on category too.
- Voice-activated (VOX / "eco mode") monitors: these transmit only when there's sound to send. In a quiet nursery, the transmitter is idle most of the night. If a monitor offers an eco or VOX mode, turning it on is the single biggest RF reduction available in the settings.
Placement does most of the work
RF falls off steeply with distance — the reading a meter away is a small fraction of the reading at contact range. That leads to simple placement rules:
- Never in the crib, on the crib rail, or right against it. This is the one placement mistake that matters most.
- Aim for 1–2 meters (3–6 feet) from the crib. Modern monitor microphones are sensitive; you don't lose function by adding distance.
- The parent unit counts too. Keep it at nightstand distance rather than under your pillow.
A sensible setup, step by step
- Place the monitor 1–2 m from the crib, ideally between the crib and the door (not between the crib and the outside wall where reception forces it to transmit harder).
- Turn on eco / VOX mode if the monitor has one.
- Use audio-only when video isn't needed — video streams continuously; audio can idle.
- If you use a Wi-Fi camera, remember the distance rule applies to it just like anything else.
- Skip "shielding" stickers and cases marketed for monitors. Distance and transmission mode are what measurably change the numbers.
Keep it in perspective
Consumer baby monitors operate within regulatory exposure limits, and this isn't an article about fear. It's about the fact that two identical nurseries — one with a continuous-transmit monitor on the crib rail, one with an eco-mode monitor two meters away — measure very differently, at zero cost and zero lost function. When cheap, easy reductions exist, take them.
We measure real devices with a standardized methodology so parents can compare actual numbers instead of marketing claims. Check the results database for monitors we've tested — and if the model in your nursery isn't there yet, request a test and we'll add it to the queue.