When to buy a baby monitor if baby still room-shares UK?

What do the NHS and the Lullaby Trust say about room-sharing?

Two official pages set the timing, and neither is a shopping guide.

• NHS — Helping your baby to sleep: “For at least the first 6 months your baby should be in the same room as you when they're asleep, both day and night.”
• NHS — Safer sleep: the safest place for the first 6 months is a cot, on their back, in the same room as you.
• Lullaby Trust — Room sharing: babies should be in the same room for the first six months for sleep, day and night. “There are no devices on the market that can replace a parent or carer being in the same room as baby for safer sleep.”
• Lullaby Trust — Baby monitors: there is no research showing monitors help prevent SIDS. “A monitor can never replace a parent or carer’s supervision of a baby.”

Room-sharing here means the baby in their own clear, flat sleep space (cot or Moses basket) in your room — not a monitor in a nursery down the hall. The Trust is also clear you can leave the room for a cup of tea; the rule is about where they spend the sleep, not about never standing up.

Can you spend £0 while you still room-share?

Yes, for the monitor itself. If the cot is beside the bed, your ears are in the room. A parent unit on the bedside table is a second speaker pointed at a baby you can already hear. Many UK parents still buy early because lists and gift registries treat a monitor as “nursery kit”. Official safer-sleep pages do not.

When does a monitor start to have a job?

The job appears when you and the sleeping baby are no longer in the same room for a stretch: a move to their own room, or a nap behind a closed door you cannot hear. Shopping sites sometimes mention waiting until around six months. That lines up with the official room-sharing minimum, but the trigger is the move, not the birthday. Some babies stay in the parents’ room longer; the Trust says needs change as they grow, and the six-month line is a minimum.

• Own room at night, you downstairs: audio first. Which? audio Best Buys have sat under £30.
• You want to see a roll without opening the door: video, with the battery cost Which? measured (video parent units averaging about 7 hours in the 2019 set).
• You are still in the same room every night: the official pages do not ask you to add a device.

How do you time the purchase without buying twice?

1. 1
   Follow the six-month room rule first Keep night and day sleeps in your room for at least the first six months, in their own cot or Moses basket. A monitor in a prepared nursery does not meet that rule.
2. 2
   Buy nothing until a door will sit between you When a move date is real — not a painted nursery — choose audio if the only gap is hearing, video if you also want a picture. High-street DECT audio is about £15–£20.
3. 3
   Do not treat a monitor as a SIDS device The Lullaby Trust states there is no research showing monitors prevent SIDS. Movement and breathing pads are a different product; this page does not cover them, and they do not replace room-sharing.
4. 4
   If someone gifts a monitor early Leave it boxed until the baby leaves your room, or use it only for the odd downstairs nap. Register the model if you keep it, and keep the original charger.

What about daytime naps in another room before six months?

The NHS and Lullaby Trust wording is day and night. A regular daytime sleep alone in a nursery is the situation those pages are trying to reduce in the first six months. Popping out for a cup of tea is the exception they both describe. A monitor does not turn a solo daytime sleep in another room into room-sharing.

In shortIn short: official UK advice is same-room sleep for at least the first six months, day and night, and a monitor is not a substitute. Spend £0 while the cot is in your room. When they move, a cheap DECT audio set covers the new door; video is optional. Neither purchase changes safer-sleep practice.