Nappy clip movement monitor vs under-mattress pad what they measure

What are the three simple movement-monitor types?

The Lullaby Trust groups the monitors it uses on CONI into three simple movement designs. They all try to notice that the baby’s body has stopped moving for a pre-set pause — usually about 20 seconds — and then sound an alarm. They do not measure blood oxygen. They are not the sock-and-app gadgets that claim a pulse-oximetry reading. If you landed here from a sock article, you are in the wrong aisle.

Official records show there is no research that movement monitors prevent SIDS. The Lullaby Trust still uses these three simple types on CONI because extra numbers (heart rate, oxygen) can add anxiety rather than reassurance.

How do I tell which type I am holding?

1. 1
   Look for a pad the size of a place-mat If the kit includes a flat sensor that goes under the mattress, you have a mattress monitor. The Trust says it usually sits on the base. Angelcare install pages add: logo / printed side up, in the centre. This is the type that needs a hardboard on many slatted UK cots — see hardboard under a movement sensor pad.
2. 2
   Look for a clip the size of a large clothes-peg If the whole monitor clips onto the nappy and has no floor pad, you have a skin-contact clip-on. CONI’s example is Snuza HeroMD. The maker’s manual says the silicone tip must touch the tummy, on a snug nappy, and that the unit is not for co-sleeping.
3. 3
   Look for tape, a foam disc and a tube or wire If a small sensor is stuck to the skin and a lead runs to a box, you have a taped skin-contact monitor. The Trust’s parent page says to stop using these after six months of age or when the baby can roll, reach and grasp, because of the higher risk of accidents with wires and tubes.
4. 4
   Reject the ‘breathing monitor’ shopping label UK retail copy collapses all three into one phrase. Ask: is the sensor on the mattress, on the nappy, or taped to skin? Then read whether the box also carries MD — how to tell if a movement monitor is a medical device.

Does an under-mattress pad count breaths?

Not in the way a hospital apnoea lead does. The Lullaby Trust describes mattress monitors as picking up the baby’s movements, including the movement of breathing. Angelcare’s UK help is blunter for its own pad: it is designed to detect movement on the mattress, not breathing, and it cannot tell the baby’s movement from yours if a next-to-me is touching the adult bed. Which? describes typical pads as alerting if the baby stops moving for more than about 20 seconds.

Nanny’s CONI write-up sits closer to the Trust’s wording: a certified medical device that watches breathing movements and warns of a decrease or a long pause. The Nanny BM-02 / BM-03 note in the factsheet gives a weight window of 2 kg to 15 kg and says the screen does not replace in-person supervision. Angelcare AC25-1 is listed there as a mattress-type unit with a wireless pad, four sensitivity levels, and an alarm on the parent unit if no movement is detected for 20 seconds.

Because the pad reads the mattress, anything that shakes the cot can look like a baby: walking on parquet or a floating floor, a fan, a mobile, or a moving pram. That is the subject of movement monitors in a pram or car and Angelcare alarms while the baby is still breathing.

What does a nappy-clip monitor measure that a pad cannot?

A clip does not need a flat cot base. CONI’s factsheet describes Snuza HeroMD as a portable unit with no cords, wires, sensor pads or external power, clipped to the nappy, watching abdominal (breathing) movements while the baby sleeps. The same sheet gives the 15-second vibrate / further five seconds to audible alarm sequence, and a warning if movements fall below eight per minute.

That is still abdominal movement, not an oxygen number and not a sock. The Trust keeps heart-rate and pulse-oximetry monitors off CONI because the extra detail is hard to interpret without clinical training. A clip can travel to a Moses basket in another room in a way a wired pad cannot — and it can still pick up motion that is not the baby if the baby is in a moving car seat. The maker’s own product page also says HeroMD is not suitable for co-sleeping.

Snuza sells more than one clip. The Trust’s medical-device examples name HeroMD, not every clip in the range. Read the MD / CE / UKCA marks on the unit you actually have.

When does the Lullaby Trust say to stop a taped sensor?

After six months, or earlier if the baby can roll, reach and grasp. The parent page and the coordinator factsheet use the same cut-off: wires and tubes become an accident risk once the baby is active. That stop-date is about entanglement, not about a pad or a cordless clip. A mattress pad and a nappy clip do not have that six-month wire rule, but CONI still plans most monitoring to end around six months because that is when the Trust says the risk of sudden death has already fallen.

In shortA pad measures mattress movement. A nappy clip measures tummy-wall movement. A taped sensor measures tummy-wall movement through a lead, and the Lullaby Trust says to stop that lead after six months or once the baby can roll. None of the three is a sock, and none is evidence that SIDS has been prevented.