Week 8
The size of a blueberry
≈ 1.6 cm (0.6 in)
The fingers start to separate. The embryo already moves, but you can’t feel it yet.
Coming soon to Android and iPhone · free
Your pregnancy, one week at a time.
Watch your baby grow week by week, plan a baby list without overspending and never miss another appointment or vaccine. Sign in with just your email, no password, and keep everything when you change phones.
- Medically reviewed
- WHO-based guidance
- No ads
Week by week
How big is your baby now?
Tap a week. In the app, Lu shows this every day, with what changes for the baby and for you.
Week 11
The size of a strawberry
≈ 4.4 cm · ≈ 45 g (1.6 oz)
Bones start to harden and nails begin to form.
Week 12
The size of a lime
≈ 5.6 cm · ≈ 58 g (2 oz)
Opens and closes the hands and moves a lot. The heartbeat can be heard at antenatal visits.
Week 16
The size of an orange
≈ 150 g (5 oz)
Movements become more coordinated. Some people already feel the first flutters.
Week 18
The size of a mango
≈ 220 g (8 oz)
About 17 to 20 cm from head to toe, and starting to hear sounds.
Week 20
The size of a small papaya
≈ 330 g (12 oz)
Halfway there. The baby has periods of activity and rest. Ask about the whooping cough vaccine.
Week 28
The size of a pineapple
≈ 1.2 kg (2.7 lb)
The third trimester begins: brain and lungs mature. Where available, it’s time for the RSV vaccine.
Week 34
The size of a melon
≈ 2.4 kg (5.3 lb)
The lungs are almost ready. A good time to have the hospital bag and car seat ready.
Week 39
The size of a small watermelon
≈ 3.4 kg (7.5 lb)
Keeps gaining weight and practising sucking and breathing. Every baby has its own time.
Sizes are averages (Hadlock 1991; Robinson and Fleming 1975): your ultrasound shows your baby’s actual size.
How it works
Start in under a minute.
Add your due date and sign in with your email, no password: a code arrives and you’re in. The app already knows which week you’re in.
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1
Add your due date
Don’t know it yet? That’s fine: the baby list, tasks and notes work without it.
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2
Follow every week
The baby’s size, what changes for both of you and what to do at this stage.
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3
Let the app remember
Appointments, tests and vaccines with a reminder on the right day, discreetly.
The baby chest
A baby list that fits your home, not the shop window.
Four questions and the chest works out how many of each item make sense for you. Every number shows its own maths, so you can decide without guilt or overspending.
- How many babies?
- How often do you do laundry?
- What’s the weather like?
- Disposable or cloth nappies?
Cloth nappies · 24
8 a day × 3 days of rotation, washing every other day.
- Record what arrived: bought, gift, borrowed or hand-me-down.
- Hospital bag and documents in the same place.
- What paediatric safe-sleep guidance advises against stays out, like cot bumpers.
And there’s more
Made for the good days and the hard ones.
A sky of 40 stars
Each week lights a star. Tap any of them to look back at what happened.
Discreet reminders
The lock screen only shows “Nanalu”. Nobody finds out before you’re ready. Appointments, tests, vaccines and a note at the start of each week.
Warning signs
WHO danger signs, explained calmly, with a button to call your local emergency number.
Questions for your appointment
Write down questions as they come and take them all to your next visit.
Twins? Covered.
The chest multiplies what each baby needs, not the bath.
Care at every stage
Birth, loss or a change of plans: the app respects the moment and never deletes anything unless you ask.
Privacy
What’s yours stays yours.
- No password. You sign in with just your email and a one-time code.
- Protected storage. Your data lives on your phone and in an encrypted copy on our servers in São Paulo, Brazil.
- No ads, no tracking. We never sell data or use it for advertising.
- Truly yours. Export everything or delete your account with one tap, right in the app.
Who makes it
Made by doctors, with sources you can check.
All content is medically reviewed, and every health tip shows its source in the app. Outside Brazil, guidance follows the World Health Organization and is being adapted country by country.
Dr. Wilson Nunes NetoPhysician responsible for the content · CRM-SP 263817 (Brazil)
MedUnityMEDUNITY LTDA - ME · CNPJ 59.158.563/0001-55
Brazilian digital health company based in Caldas Novas, Goiás.
Brazilian digital health company based in Caldas Novas, Goiás.
- Antenatal and postnatal careWorld Health Organization
- Safe sleepAmerican Academy of Pediatrics
- Baby sizeHadlock 1991 · Robinson and Fleming 1975
- In BrazilMinistry of Health and Brazilian Society of Pediatrics
FAQ
Frequently asked questions
Is Nanalu free?
Yes. At launch, Nanalu is free and has no ads. If paid features ever come, we will tell you clearly and in advance.
Do I need an account?
Yes, but it’s quick: just your email, no password. A code arrives and you’re in. The account keeps everything safe when you change phones, and you can delete it any time, with all its data.
Does it work offline?
Yes. The app saves everything on your phone first and sends it to your account when you’re back online. You only need internet to sign in the first time.
Does Nanalu replace antenatal care?
No. Nanalu is informational and helps you organise your pregnancy. Appointments, tests and decisions are with your care team. In an emergency, call your local emergency number.
Where does the health information come from?
From official sources: outside Brazil, the World Health Organization and the American Academy of Pediatrics; in Brazil, the Ministry of Health and the Brazilian Society of Pediatrics. All content is medically reviewed, and the app shows the source next to each tip. Vaccines and schedules vary by country, so the app always asks you to check with your care team.
What if I don’t know my due date yet?
That’s fine. The chest, tasks and notes work without it. When you know it, just add it and Lu will show the week and the baby’s size.
When is it coming to Android and iPhone?
Soon, on Google Play and the App Store. Tap “Notify me” and send the ready-made email: we’ll let you know when it’s out.
Another question? Get in touch.
Lu is almost here.
Coming soon to Google Play and the App Store. Want to know the day it’s out?