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Health disclaimer

Last updated: 5 September 2026 · Version 1.0

This is the most important page on this site. Please read it before you rely on anything Lullabean shows you.

If you are worried right now

Call 999 if your baby is seriously unwell — struggling to breathe, unresponsive, having a fit, or a rash that does not fade when you press a glass against it.

Call 111, or your GP, midwife or health visitor, for anything else that concerns you.

Do not wait to see what the app says. Lullabean has no idea how your baby looks, sounds or feels, and you do.

What Lullabean is for

Lullabean's purpose is record keeping and information display for parents. It does three things:

  1. It stores what you enter — feeds, nappies, sleep, temperatures, weights, lengths, head circumferences — and keeps that record in sync between two parents' phones.
  2. It does arithmetic on what you entered and shows the working. A suggested bottle volume is your baby's weight multiplied by a rate and divided by a number of feeds. A centile is your baby's measurement plotted against the published UK-WHO reference tables. The app shows you the sum it did so you can see whether you agree with it.
  3. It restates published guidance at fixed points. When a temperature falls into a particular range for your baby's age, the app shows you the relevant NHS line. When you choose a nappy colour, it shows you what the NHS says about that colour. It quotes; it does not conclude.

Lullabean is not a medical device. It is not registered with the MHRA and does not carry a UKCA mark, because it is not intended for the diagnosis, prevention, monitoring, prediction, prognosis or treatment of any disease or condition. It is a diary with a calculator and a quotation of published guidance, and that is all it is intended to be.

What Lullabean deliberately does not do

  • It does not diagnose. No screen in the app tells you what is wrong with your baby, because it does not know.
  • It does not decide. There is no algorithm judging whether your baby is feeding enough, sleeping enough, growing well or being parented correctly. Lullabean has no opinions about you.
  • It does not predict. There is no sleep-training engine, no optimal-nap-window model, no forecast of what your baby will do next.
  • It does not replace a professional. Nothing in the app is a substitute for advice from your midwife, health visitor, GP, pharmacist or NHS 111.
  • It does not track medication. There are no dose fields and no drug names, on purpose.

If Lullabean ever appears to be telling you what to do about your baby's health, that is not what it is doing, and it is not what it is for.

The specific numbers, and what they mean

Feed volume suggestions

The suggested bottle amount is a pre-fill so you don't have to do mental arithmetic at 3am. It is your baby's most recent recorded weight, multiplied by a standard millilitres-per-kilogram-per-day rate for their age, divided by a typical number of feeds a day, rounded to the nearest 5 ml. The app shows you that sum on screen.

It is not a prescription and it is not personalised to your baby beyond their weight and age. Babies vary enormously. A baby who is mixed feeding, unwell, premature, or simply hungrier than average will need something different, and the number the app suggests knows none of that. Overwrite it whenever your judgement says otherwise, and take feeding advice from your health visitor or midwife rather than from us.

Where you are mixed feeding, the app cannot know how much milk came from the breast, so it cannot know your baby's total intake. It says so on screen when this applies.

Growth centiles

A centile is a plot, not a verdict. Lullabean takes the measurement you entered and places it against the UK-WHO growth reference tables — the same data behind the charts in your baby's Red Book. For a baby born preterm it uses corrected age, as those charts require.

A single centile means very little on its own, and the app does not interpret trends, does not flag "faltering growth", and does not tell you whether a change matters. That interpretation belongs to your health visitor, who will also be weighing your baby on calibrated scales. Home scales and bathroom-floor weigh-ins are not equivalent, which is why the app records whether a measurement came from home or from a health visitor.

Temperature bands

The colour bands are age-aware thresholds taken from NHS guidance. When a reading crosses the highest threshold for your baby's age, the app shows one line: the NHS advice to contact 111 or your GP. It does not tell you your baby has an infection, and it does not tell you not to worry.

Thermometers vary, and the method matters — an armpit reading is not the same as an ear reading. Your baby's overall condition matters far more than the number. A baby who seems very unwell needs help regardless of what the thermometer says, and a baby who is bright and feeding well is reassuring even if the number is up.

Nappy guidance and check-ins

The colour notes and frequency guidance restate NHS positions about what is usual and what is worth raising with a professional. Two limits worth knowing:

  • The app cannot tell the difference between "no nappy happened" and "nobody logged it". For that reason it never raises a health concern from missing data — only from days you have confirmed. If you are logging patchily, the app will stay quiet rather than guess.
  • Nappy guidance is general, and specific to no baby. A pattern that is fine for one baby is not for another. Your health visitor knows yours.

Reminders

Feed, vitamin D and weigh-in reminders are convenience nudges computed from your logs and your settings. They are not a clinical alarm and they can fail. Push notifications depend on Apple's and Google's networks, your phone's settings, your battery-saver mode and your signal, and any of those can silently drop a message. Never rely on Lullabean as your only prompt for anything that matters.

No health guidance in Lullabean is ever delivered as a push notification. Concerns about your baby's health appear in the app when you open it, never on your lock screen at 3am.

Where the guidance comes from

All health content in Lullabean is taken from NHS sources and is cited in the app's source code. The principal sources are:

  • NHS guidance on fever and high temperature in babies and children, and the age thresholds for contacting 111 or a GP
  • NHS Best Start in Life guidance on constipation and breastfeeding, including expected nappy frequency by age and feeding method
  • Derbyshire Community Health Services NHS Foundation Trust, Baby poo & wee — the meconium timeline, colour guidance, and the 6–8 wet nappies a day hydration reference
  • UK-WHO growth reference charts (0–4 years) and the underlying LMS reference tables, as used in the Red Book and published by the RCPCH
  • NHS guidance on vitamin D for babies and children

Where a commercial parenting website and an NHS source disagree, we follow the NHS. Commercial sources are never cited in the app.

Guidance changes. We review the health content in Lullabean at least annually and when we become aware of a change, but the NHS website is always more current than we are. If something in the app contradicts nhs.uk, nhs.uk is right — and please tell us at support@lullabean.co.uk so we can fix it.

Accuracy is a shared job

Lullabean can only be as good as the information typed into it. A weight entered as 4.2 kg when it was 4.7 kg produces a wrong centile and a wrong feed suggestion, and the app has no way of knowing. A temperature logged from the wrong method, an entry backdated to the wrong hour, a feed nobody remembered to record — all of these change what the app shows you, and none of them is something we can detect.

Please check what you enter, and please treat the record as an aide-mémoire rather than a source of truth about your baby.

Questions

support@lullabean.co.uk · Eelavan Ltd, 86-90 Paul Street, London, United Kingdom, EC2A 4NE