Why is my baby monitor picking up the neighbours in a UK flat?

Why can I hear next door's baby?

A baby monitor is a short-range radio. In a block of flats that radio shares the building with other monitors, cordless phones and a stack of 2.4 GHz Wi-Fi. If your set is analogue, it is closer to an open walkie-talkie: anyone on the same channel can land in your speaker. If it is a cheap 2.4 GHz digital or FHSS unit, it still sits in the same crowded band as neighbours' routers, so you get crackle, drop-outs, or — less often — a burst of someone else's nursery.

A DECT set behaves like a paired cordless phone. The baby unit and parent unit register to each other. Makers such as Philips describe that link as encrypted and as sitting away from Wi-Fi gadgets. Marketing lines that say "zero interference" are ad copy — this page will not repeat them as fact — but the pairing step is why DECT is the usual upgrade when an analogue £15 unit plays next door's bedtime.

Hearing the neighbours is almost always crosstalk or a shared analogue channel. It is not, on its own, evidence that someone has "hacked" a Wi-Fi camera. For app cameras, use the NCSC password and update steps instead of assuming a radio mix-up.

Analogue, 2.4 GHz and DECT: what is the difference?

How do I stop the crosstalk?

1. 1
   Read the badge on the baby unit Look for "analogue", a tiny channel switch (CH1 / CH2), "DECT", or "digital". A two-channel slider is a strong analogue clue.
2. 2
   Change channel or re-pair On analogue, try every channel at night when next door is also on. On digital / DECT, use the manual's pairing or "link" reset so the parent unit forgets any other baby unit it might have heard.
3. 3
   Move both units off the party wall Pull the baby unit toward an internal wall and keep it out of cot reach (cables included). Distance from the neighbour's transmitter matters more than volume on your handset.
4. 4
   Turn neighbours' kit into a test If the extra voice vanishes when you take the set to a friend's house, the building is the interferer. If it follows you, the units are not paired or the set is faulty.
5. 5
   If it is analogue and still open A paired digital or DECT audio set is the usual next step. Staying on analogue in a stacked building is how you keep hearing other flats.

Do not start scanning other people's Wi-Fi or opening ports. That is not how you fix a speaker that already plays next door, and it is the opposite of the NCSC's UPnP advice.

Does hearing the neighbours mean they can hear us?

On analogue, yes, the path can run both ways: if their unit is on your channel, they can hear your nursery too. A 2008 *Salisbury Journal* report described a family's analogue monitor coming through a neighbour's television — that is bleed, not a targeted break-in. On a paired DECT link, casual overhearing is what the pairing is meant to stop. On a Wi-Fi camera, the risk the NCSC writes about is a guessable password and remote view left on, not a neighbour's baby unit.

None of that is a claim that any model is "hack-proof". Official records describe pairing, passwords and updates. They do not hand out an all-clear.

What have UK reports shown about analogue bleed?

Local papers have, for years, written up analogue monitors appearing on nearby TVs or radios. The Salisbury case is one dated example. It is useful as a picture of unpaired analogue radio, not as a reason to panic about every digital set. Which? still tests for interference from other devices when it scores sound quality — another reminder that 2.4 GHz homes are noisy.

Manufacturer support pages (Angelcare among them) also list wireless interference as a normal support topic: microwave ovens, other monitors, and thick walls. That is the same physical story as a UK landing with four routers in range.

When should I change the set, not the channel?

Change the set if it is analogue, if re-pairing does not stick, or if you need video without joining the building's Wi-Fi pile. A non-Wi-Fi digital video parent unit avoids both analogue bleed and the 2.4 GHz camera join. The Lullaby Trust's position is unchanged: a monitor is not a SIDS device and does not replace room-sharing for the first six months.

In shortName the radio first. Analogue in a stack of flats is how next door lands in your speaker. Re-pair or move off the party wall; if the box still has a CH1/CH2 slider, a paired digital or DECT audio set is the practical change. Crosstalk is interference, not a verdict that someone is watching you.