How to Fit a Modern Cloth Nappy: The Leak-Proof, No-Fail 4-Step Guide
I was in my last trimester and decided to learn how to fit a cloth nappy from a YouTube tutorial. My partner, a first-time parent like me, decided to join in.
We sat down with a stuffed teddy who seemed indifferent to the idea of roleplaying the newborn baby. We followed instructions and tried to understand the terms: rise snaps, hemp inserts, double gussets. After 15 minutes of snapping and unsnapping, my partner gave up. (He’s an engineer, by the way, who designs and constructs complicated circuits for a living.)
But I was determined to learn. And deep down, I knew cloth nappies weren’t this complicated. I was right!
The fault wasn’t in the nappy but in the confusing instructions. This is why I’m sharing the actual techniques—not just the steps—that will help you prevent cloth nappy leaks and confidently manage every change.
Master the basics in 4 simple steps. Learn the essential techniques that make cloth nappies easy and leak-proof.
"My partner, a first-time parent (and an engineer who designs complex circuits), gave up after 15 minutes of snapping and unsnapping. I knew it couldn't be that complicated. The fault wasn't in the nappy—it was in the confusing instructions."
Once you understand these 4 foundational steps, cloth nappies become second nature. We're here to share the techniques, not just the steps, to help you confidently manage every change.
Before you begin, familiarize yourself with these essential terms that will make everything else easier:
One Size Fits Most nappy with adjustable snaps to fit your baby as they grow.
The waterproof outer cover with snaps for adjustments and a pocket or snaps for inserts.
Absorbent materials (hemp/bamboo) that go inside the nappy. They fit in a pocket or snap inside.
3-4 sets of snaps on the front that adjust the nappy length for your baby's size.
Snaps on the waist to find the right fit around baby's tummy.
Corner snaps that prevent the nappy from digging into thighs or leaking.
Adjust the rise snaps to fit your baby's size. This only needs to be done when your baby grows—not at every change.
Newborns: Connect top rise row to bottom row for smallest setting.
Older babies: Connect top row to middle row, and so on.
You don't need to unsnap rise snaps when washing! Only adjust when baby grows to the next size.
Place your hemp or bamboo insert into the nappy pocket or snap it to the inside of the shell.
For boys & heavy wetters: Place wider part of insert at the front.
For girls: Place wider part at the back.
Fold or double the inserts for extra protection during long naps or overnight.
This is different from disposable nappies! Placement is key to preventing leaks and ensuring a comfortable fit.
Unlike disposable nappies, placing a cloth nappy high up the back causes sagging, gaps, and leaks.
This is the most common mistake new cloth nappy users make!
Position the back edge just below baby's bum, like underwear. This creates the perfect snug fit.
Think: underwear placement, not disposable nappy placement.
Pull the nappy up around baby's tummy.
Attach thigh/leg snaps first, then waist snaps.
Before you dress baby, run this quick check to ensure a snug, comfortable, leak-proof fit:
The nappy should fit snugly around waist and legs with no gaps, but loose enough to comfortably fit one finger.
Light pink marks are normal (like from socks). Deep red marks mean it's too tight—adjust the snaps.
Make sure no absorbent insert is poking out of the waterproof shell—this causes wicking leaks.
The nappy should extend from just above bum crack to just below belly button for full coverage.
You've mastered the 4 essential steps. With practice, you'll be changing cloth nappies as quickly and confidently as disposables—and you'll never look back!
Now that you know the essentials, let's explore each step in depth. Scroll down for the full guide with helpful photos and pro tips!
Phase 1: Pre-Set the Nappy Length (The Rise Snaps)
Before your baby is even on the change table, you must set the rise snaps. These are the rows of snaps on the front of a One Size Fits Most (OSFM) shell and control the length of the nappy, which determines the size of the leg holes.
You should only change this setting when your baby grows to the next size.
- Sizing: Lay the open nappy next to your baby. The nappy should extend from just above their bum crack to just below their belly button. If the nappy is too long, snap the front rows together (e.g., top row to bottom row for the smallest setting).
- Tuck Up the Fabric: Once the rise snaps are set for a smaller size, there will be excess fabric in the middle. Crucially, push this excess fabric up and flat toward the waistband. This ensures the elastics are pulled snug and prevents wicking in the front.
Phase 2: Insert, Placement, and Prep
Next, prepare the absorbent core and place the nappy correctly on your baby.
- Adding Absorbency: Place or snap your inserts (boosters) inside the outer shell. For babies who wet heavily in a specific area (usually boys at the front, or girls in the middle), place the widest part of your hemp or bamboo insert
- Place Low (Like Underwear): Unlike a disposable, the cloth nappy needs to sit low at the back. Position the top back edge of the nappy just above your baby’s bum crack. The nappy should fit like a pair of underwear, not high up around the back.
- The Boy Tip: If you’re changing a baby boy, make sure their penis is pointed downwards before you pull the front up. This directs the urine into the absorbent core and prevents those frustrating upward leaks.
Phase 3: The Seal (The Legs Are Everything)
The leg seal is the single most important barrier against leaks. If the legs fit, the nappy works.
- The “Taco Fold”: As you pull the front of the nappy up between your baby’s legs, slightly pinch the fabric in the middle to create a taco shape. This helps scoop the fabric up and into the knicker line (the crease where the thigh meets the body).
- Lock the Legs First: Bring the wings around the front. Always secure the snaps that are closest to the legs first. This ensures the primary leak barrier is locked in place before you worry about the waist.
- Fasten the Waist: Fasten the remaining waist snaps. The wings do not need to be symmetrical—it is common to stagger the snaps (one side tighter or looser than the other) to get the perfect fit around a chunky thigh and a smaller waist.
Phase 4: Final Check and Troubleshooting
Before you dress your baby, run these two checks to confirm you’ve achieved a leak-proof fit.
- The Leg Check (The Undie Line Rule): Run a finger around the entire leg opening, from front to back, ensuring the leg elastic sits snuggly inside the groin crease/undie line all the way around. There should be no gaps visible when your baby moves.
- The Two-Finger Waist Check: You should be able to comfortably fit two fingers down the front of the nappy at the waist. A cloth nappy waist should be loose—if it’s too tight, it will cause compression leaks (squeezing the fluid out of the absorbent insert).
- The Tidy Check: Ensure no part of the absorbent insert is sticking out of the waterproof outer shell. Any material poking out will act like a wick and pull moisture straight onto your baby’s clothes.
- Red Mark Troubleshooting: It is perfectly normal to see light pink marks (like from socks) when you take the nappy off. However, if the marks are deep red and take longer than 15 to 20 minutes to fade, the nappy is too tight and needs to be loosened immediately for the next change.