Size charts
Find theright fitfrom day one
Not sure which size to start with? Start with Size 00 – you can update your subscription at any time once baby arrives.
Size
Weight Range
Trial Pack
Monthly Box
Size 00
Up to 4kg
Up to 9.9lbs
31 nappies
186 nappies
Size 01
4–8kg
8.8–17.6lbs
33 nappies
198 nappies
Size 02
5–9kg
11–19.8lbs
31 nappies
186 nappies
Size 03
7–13kg
15.4–28.7lbs
28 nappies
168 nappies
Size 04
10–17kg
22–37.5lbs
25 nappies
150 nappies
Size 05
12kg+
26.5lbs+
22 nappies
132 nappies
Size 06
16kg+
35.3lbs+
18 nappies
108 nappies
Size
Weight Range
Trial Pack
Monthly Box
Size 4
8–15kg
17.6–33lbs
~2–3 months
Update from your account anytime.
Size 5
15–18kg
33–39.7lbs
~4–7 months
Update from your account anytime.
Size 6
17kg+
37.5lbs+
~8–18 months
Update from your account anytime.
Still unsure?Message our Nappy Concierge on WhatsApp before your box ships and we'll help you choose.
Video
Video: Changing Tips
A video guide for how to perfect Peachies fit and give you the best protection against blowouts
How to fit perfectly
How to get a
perfect fit
Check waist height: the top of the landing strip should sit 1 finger (laying them horizontally) under the baby's belly button
Secure the tabs: land the tabs in line with or on the Peachies logo
You should be able to run a finger inside the waistband
Run a finger inside the legs: make sure the ruffles and the inner leg cuffs aren’t tucked in!
Note: Pants should also sit in the same place on baby’s belly
When to size up
When to size up
A stat here about babies being in nappies too small for too long...
Waist sits 2 or more fingers (when laid horizontally on baby's belly) below the belly button
Sticky closure tabs barely close at the edges of the landing zone. The landing zone is the patch where you find the Peachies logo on the nappy front
You should be able to run a finger inside the waistband
Nappy leaving lasting red marks or indents on baby's waist and thighs
You experience an increase in leaks, poo explosions, and tears, especially overnight and especially out the back of the nappy or pant
When to size down
When to size down
A stat here about babies being in nappies too big....
Nappy or pant sags around the legs, sometimes or often leading to leaks
Sticky tabs are close together or could overlap. Avoid tightening the tabs so that they overlap
There are gaps at the waist between nappy and skin
Baby's hip is visible on the side and not covered by the tabs pulled across and secured to the front
Sizing Quiz
Let’s find your baby’s perfect fit
It only takes 30 seconds.
We'll ask a few quick questions about your little one - nothing tricky, promise! We only collect the info we need to help choose the right size for them. Then our smart prediction will match you with the nappy size that keeps your baby comfy, dry, and happy from day one.
As a thank you, you’ll also get a unique discount code for your first order.
Complete your ritual
FAQs
Nappies (the ones with tabs) are your go-to for newborns and less wriggly babies - easy to fasten while they're lying down, with adjustable sides for the perfect fit. Pants pull up and down like underwear, built for babies who are wriggling, crawling, standing, or already halfway out the door. Both give you the same nappy-level absorbency and wetness indicator - the difference is really about your little one's stage, not their protection.
Still deciding? Read our full guide to nappies vs. pants →
Between 18–33 nappies, depending on the size you choose - enough for about a week with Peachies, so you and your little one can properly put us through our paces.
Every layer is chosen with care - from a super-absorbent core (using sustainably sourced wood pulp) that pulls moisture away from skin, to a soft, cloth-like outer that stays gentle against your baby all day. You'll also find a wetness indicator and our signature disposal tab, so everything stays simple from wear to bin.
For the full ingredients list, see the complete breakdown here →
We're not going to tell you we've solved sustainability. No brand has. What we can tell you is this: better absorbency and a better fit mean parents use fewer nappies, not more. Over a lifetime of nappies, that's the difference between roughly 7,000 and 4,000 - nearly half.
That's the real story. Not a green logo on the pack. Just nappies engineered to work harder, so you need fewer of them.
And because they're doing more with less, you're not trading anything to get there - same (or better) overnight protection, same gentleness on skin. Less waste, less laundry, fewer 3am changes. Everyone wins, including the planet.
We'd rather earn that trust with the maths than the marketing.
8 out of 10 leaks are attributed to sizing issues - so getting it right makes a bigger difference than almost anything else. A few quick checks:
- The landing strip should sit about a finger's width under baby's belly button
- You should be able to slide a finger inside the waistband
- Run a finger round the legs to make sure the cuffs aren't tucked in
Consider it your all-access pass to real humans - a level of support you won't find with any other nappy brand. Our expert team is on WhatsApp around the clock. Ready for sizing questions, "is this normal?" moments, or making sure your next delivery lands right on time. It's not just customer service. It's having a very knowledgeable friend in your corner, whenever you need one.
Order before 4pm on a weekday and we'll ship it the same day - with next-day delivery. Order after 4pm, and we'll ship the next working day instead. Weekend orders ship the following business day, landing with you the day after that.
You'll get a tracking link by email as soon as your order ships, so you can follow it every step of the way. If it's running later than expected, our Nappy Concierge team is on hand on WhatsApp to chase this up for you.
We'd love to sort this for you - drop us a message at hello@wearepeachies.com and we'll see what we can do.
WhatsApp our Nappy Concierge
Message our Nappy Concierge on WhatsApp before your box ships. We’re here to help with any questions, advice, or changes you may need.
Pause anytime • No commitment • Delivered when you need it
Expert Tips
More Tips from our Experts
Sex after birth. Relationships under pressure. Getting yourself back, whoever that is now. This is the edit that goes where most parenting content doesn't. Honest, useful, and completely judgement-free
