Why do newborn breathing pauses set off a movement monitor?

What is the monitor actually timing?

A movement monitor does not watch oxygen or decide whether a pause is periodic breathing. It waits for movement, including the rise of the chest or tummy, and sounds an alarm if it detects none for a pre-set time. The Lullaby Trust's public monitors page and its CONI coordinator factsheet (reviewed November 2025) both say that time is usually 20 seconds.

Some medical movement units also alarm if the breathing rate falls below a factory minimum. The Nanny BM-03 maker's specification, for example, lists a warning when the rate is under 8 breaths a minute. That is a second timer, not a verdict on why the baby paused.

The Lullaby Trust states there is no research showing monitors prevent sudden infant death syndrome (SIDS). A monitor is not a substitute for an adult in the same room for the first six months, or for safer-sleep advice.

Why do newborns pause between breaths?

Newborn breathing is irregular compared with an adult's. The CONI booklet for families says babies often have short pauses between breaths, and that 20 seconds is unusually long. NHS Lothian's parent sheet *Assessing your baby's breathing* (hosted on NHS Scotland's Right Decisions) describes a cycle: breaths get faster and deeper, then slower and shallower, then a pause of up to five seconds before deepening breaths start again. Just One Norfolk (NHS) calls pauses of up to 10 seconds, then a run of quicker breaths, periodic breathing, and says this is different from apnoea.

That pattern is why a parent who has just watched a three- or five-second pause can feel the 20-second alarm as proof something is wrong. Official wording puts those events on different sides of a line: short pauses are described as usual; a 20-second pause is the unusual threshold the box is built around.

How long is a usual pause, and what is 20 seconds?

UK leaflets do not all use the same number for a "usual" pause. They do agree that 20 seconds sits in the unusual / apnoea range. This table quotes those pages; it is not a MayTally clinical rule.

The Lullaby Trust adds that even after a lengthy pause, most babies respond very quickly to touch. On rare occasions the baby needs resuscitation. That is why the alarm plan ends at 999 on speaker, not at a homemade countdown.

What else can set the alarm off besides a long pause?

The CONI factsheet lists false alarms as a known disadvantage. The sensor may have come loose, or the tummy movements may be too slight for that sensitivity setting. External movement works the other way: the pad can pick up a car, a pram, footsteps on some floors, or an adult sharing the sleep space, and stay quiet when the movement is not the baby's. The Trust says that can give false reassurance.

• Loose or poorly placed pad — taped skin sensors need firm contact; mattress pads need to sit flat under the mattress as the maker shows.
• Sensitivity — some mattress units (the CONI factsheet names four levels on the Angelcare AC25-1) can be set so light movement is missed.
• Co-sleeping or a pet in the sleep space — the monitor can register someone else's breathing.
• The baby is awake — CONI advice is to use the monitor for sleep periods only and disconnect it when the baby is up.

What should I do if the alarm sounds?

Use the Lullaby Trust's published sequence. Do not invent extra clinical checks.

1. 1
   Switch the alarm off and look Look for movement of the chest or tummy. The coordinator factsheet also says to look at colour — paler than usual or blue.
2. 2
   Cheek Place your cheek next to the baby's face to feel or hear breath.
3. 3
   Stimulate — never shake Talk, blow on or touch the face, or tickle the soles of the feet. Never shake the baby.
4. 4
   No response: 999 on speaker Dial 999 at once and put the phone on speaker so the operator can talk you through what to do until help arrives. MayTally does not add CPR steps here.
5. 5
   If the baby responds, or you are worried Contact NHS 111, your midwife, doctor or health visitor. The CONI booklet says pauses that are happening more than usual can be a sign of illness and should be checked.

When is a pause a reason to get help, even without an alarm?

A quiet monitor does not mean the baby is well. NHS Lothian tells parents to look at work of breathing, colour, feeding and energy: lips turning blue or looking pale, worse in-drawing between the ribs, grunting, nasal flaring, or a baby who becomes limp or cannot feed as usual. Just One Norfolk says to call 999 if the baby stops breathing and becomes limp, pale, or blue around the mouth.

In shortShort newborn pauses and a 20-second alarm sit on different official lines. The box is timing a long gap in movement, not diagnosing periodic breathing. Check the baby with the Trust's steps; use 111 or 999 if you are worried. Do not treat a silenced alarm as a clean bill of health.