Development, as ranges
Milestones drawn as windows, never deadlines — with one small thing to try today, and a clear line about when a slow one is worth mentioning.
Nine months in.One year out.One quiet app.
babybub walks with your family from the first flutter to the first birthday — and changes shape three times on the way. Week-by-week development now. Breathing and birth plans when it counts. Sleep you can finally make sense of after.
Free while it is in beta · No account needed · Works on the ward wifi, or without it
Good morning, Maya
Week 24
24w
Lungs are practising
Breathing motions begin this week · about 30cm, 600g
24 of 40 weeks · due 2 Nov
80
Iron
45
Folate
✓
DHA
20
Calcium
◷
Glucose screening
Thursday 10:30 · bring water
Tap a stage — this is the app reshaping itself
Three stages, three shapes
The app you need at 12 weeks isn’t the app you need at 3am
So it doesn’t pretend to be. babybub keeps one home screen and swaps everything behind it — the colours, the shapes, the navigation, what a single tap does.
In the womb
Weeks 4 – 40
Soft nested curves and warm terracotta. Everything points one way: what is growing, and what you need to grow it.
Birth
From week 36
Five tabs collapse to four. The screen goes dark and rhythmic, big targets only — usable one-handed, mid-contraction, at 3am.
First year
Day 1 – 365
Sage takes over and shapes scatter like growth. The navigation widens again: sleep, logging, milestones, care.
It moves on its own — your due date, then your baby’s birthday. You can move it yourself any time, because babies arrive early, arrive late, and arrive second. Each stage has a page of its own: in the womb, birth and the first year.
Stage one · in the womb
Watch them grow, one week at a time
A week is a long time in there. Each one gets its own short read: what is forming, what you might feel, what is worth asking at your next appointment.
Development, in plain language
Organ by organ, sense by sense, with size comparisons that aren’t only fruit. Illustrated, and quiet about the rare things until they matter.
Nutrients that move with you
Iron steps up in the second trimester, so the targets do too. Log a meal, see the gap, get food ideas — not a shop full of supplements.
Your next appointment, in context
Keep the next one beside the week it belongs to, with the provider, the place and what to bring — and a reminder if you want one.
A note for whoever is with you
Part of each week is written for the person alongside you rather than the person pregnant: here’s what’s happening, here’s one thing that helps.
Week 24 · nutrients
Iron22 of 27 mg80%
Lentils, spinach, fortified oats — with something citrus
Folate270 of 600 µg45%
DHA200 of 200 mgdone
The journey so far
Every week you pass stays readable. Go back to week 9 whenever you want to remember how small it all was.
Stage two · getting ready, and going
A birth class you can open at 3am
Nine short lessons to read before, and the tools you can actually use during. All of it ships inside the app, so the hospital lift doesn’t matter.
The class
Nine lessons: stages of labour, positions, pain relief, and what a birth partner actually does. Short enough to read in a waiting room.
Guided breathing
Slow flow, 4-7-8 and box, paced on a dark screen with haptics on your phone — so you can keep your eyes closed.
A timer that means something
Not a stopwatch. It groups what you log and averages length and spacing, so the shape of the hour is legible at a glance.
Lists that split
Hospital bag, home, paperwork — twelve items in the bag alone, ticked off from the car, nothing to remember unaided.
Contractions · last hour
62s
average length
4:40
apart, tightening
Closer together and lasting longer. Your unit will want to hear this.
Hospital bag · 9 of 12
Phone charger (long cable)
Baby’s going-home outfit
Snacks for labour
Birth plan copies ×2
Watch & health data · in progress
Your body is half of this story
The next thing being built: an opt-in read of what your phone’s health store already holds — resting heart rate climbing through the trimesters, HRV against your own baseline, how much of the night you actually slept. The data model is written and in the app already; the import is not switched on yet.
babybub
74bpm
Design for the watch companion
Resting heart rate
wk 12wk 20wk 28wk 36
Up through the trimesters. That is the documented population trend — blood volume rises by nearly half. It is shown as observation against your own baseline, and it is never read as a sign that labour is close.
HRV & recovery
62 ms
HRV last night
baseline 58 ms
Several nights under your own baseline is worth saying plainly: today is a walk, not a workout. After the birth, this is the number that tracks how the recovery is really going.
Resting heart rateHRVRespiratory rateWrist temperatureSleep durationSleep efficiency
The six daily aggregates the model already holds — import strictly opt-in, and revocable. babybub is not a medical device and will not diagnose anything. It helps you notice, and tells you plainly when something is worth a phone call.
Stage three · the first year
Sleep, finally explained
One tap to log a nap, and it lands on the same timeline as everything else. Then the part nobody else does: telling you what the pattern means before it hits.
Open it in a browser when you want the wide view — a fortnight of nights at once, on a screen big enough to read them.
2 weeksMonth
9h 20 avg
night sleep · 3 wakes typical
2 weeks agolast night
Terracotta nights are the rough ones. Two in a row after the jab, then it settled — that is what a blip looks like next to a regression.
Regression radar
The 4-month shift is 3–6 weeks out
Sleep cycles mature between week 14 and 17. You get a plan three weeks early instead of a panic at 2am.
Tonight’s forecast
Bedtime sweet spot 6:45–7:15pm
Two wakes likely, near 1am and 4am
Nap 3 window 1:20–1:50pm
Wake windows
~90 min
stretching +10 min a fortnight
Longest stretch
4h 05
best yet 5h 30 · trending up
Nap consistency
time of day × fortnight
The care library
Skin and cradle cap. Hips, spine and safe carrying. Tummy time, head shape and torticollis. Reflux, vitamin D, feeding cues. Written plainly and surfaced when your baby is the right age for it.
And a check on you
Recovery, mood and sleep debt for the parent, not only the baby — because the person doing the 3am is part of what the app is watching.
Not a solo app
Two people, one baby
Nobody should have to be the person who remembers everything. Ownership and attribution are built into the record from the start — and sharing a family across two devices is the next thing after that, with the sync protocol already written and waiting.
Every feed, nap and nappy records who logged it, so the day reads correctly in the morning.
Checklist items get an owner — hospital bag, home and paperwork, split between you.
The birth class has a partner track: what to say, when to push back, how to help.
Each week has a note written for the person alongside you rather than the person pregnant.
Written against guidance
Every guide is written against midwifery and paediatric guidance and dated, and where the advice is genuinely uncertain it says so instead of picking a side.
Private by default
Your pregnancy lives in your own device’s storage, and you never have to make an account to use any of it. Nothing is sold, nothing is used for ads, and deleting the app deletes the lot.
Works where you are
Lessons, timers and lists all work offline, because the hospital wifi will let you down at exactly the wrong moment.
The four-month shift shouldn’t be something you meet in a 3am search history. It should arrive with three weeks’ notice and a plan.
Start where you are
Tell it a due date or a birthday and the app arranges itself around you — the right stage, the right week, nothing you don’t need yet. Free the whole way through the beta.
The web app runs in any modern browser and stores everything in that browser. iOS is distributed through TestFlight while it is in beta — invites go out gradually, and it is not on the App Store yet. There is no Android build.
babybub gives general information and a place to keep your own records. It is not a medical device and it does not diagnose anything. Always ring your midwife, child health nurse or GP if something worries you.