If your cloth nappies have suddenly started leaking even though the absorbency seems fine, you might be dealing with delamination.
Delamination is one of the most common causes of unexpected leaks in modern cloth nappies, and it can be frustrating for parents who are doing everything right with washing and fit.
The good news is that once you understand what delamination is and how it happens, it’s much easier to prevent and manage.
What Is Delamination in Cloth Nappies?
Delamination happens when the waterproof layer of the nappy starts to separate or break down.
Most modern cloth nappies use PUL (polyurethane laminate) as the waterproof outer layer. This layer keeps moisture inside the nappy while still allowing the fabric to remain breathable.
When delamination occurs, the waterproof layer is damaged and moisture can pass through the outer shell, causing leaks.
Signs of Delamination
Here are the most common signs to look for:
- Nappies leaking through the outer shell
- Dampness on the outside of the nappy
- Bubbling or peeling on the inside of the PUL
- Crinkly or uneven texture in the waterproof layer
- Leaks even with good absorbency and fit
If the nappy leaks straight through the shell, it’s usually a strong indicator of delamination rather than a washing or absorbency issue.
What Causes Delamination?
Delamination is usually caused by heat, harsh washing conditions, or wear over time.
1. High Heat in the Dryer
Frequent high-heat tumble drying can damage the waterproof layer and weaken the bond between the fabric and PUL.
Over time, this can lead to separation and leaks.
Tip:
Use line drying whenever possible and only tumble dry on low heat if needed.
2. Very Hot Washes
Cloth nappies can generally handle warm or hot washes, but extremely high temperatures or long exposure to heat may damage the waterproof layer.
A balanced washing routine helps protect the nappy materials.
3. Harsh Chemicals
Some products can break down PUL over time, including:
- bleach used too frequently
- strong stain removers
- vinegar used regularly
- harsh laundry additives
Using appropriate detergents and avoiding unnecessary additives helps extend nappy life.
4. Age and Wear
Like any reusable product, cloth nappies don’t last forever.
After years of use and hundreds of washes, some nappies may naturally begin to wear down and delaminate.
This is normal and often happens in heavily used nappies or second-hand nappies.
Can Delamination Be Fixed?
Unfortunately, true delamination cannot be repaired because the waterproof layer has already broken down.
However, the nappy may still be usable in some cases.
Possible alternatives include:
- using it as a swim nappy
- using it for short outings
- using it at home with extra protection
- repurposing it for training or backup
If leaks are significant, replacing the nappy is usually the best option.
How to Prevent Delamination
The best way to deal with delamination is to prevent it from happening in the first place.
Line Dry When Possible
Sun and air drying are gentler on waterproof fabrics and help nappies last longer.
Use Low Heat in the Dryer
If tumble drying is needed, keep it on a low setting.
Avoid Harsh Additives
Stick to a suitable detergent and avoid unnecessary chemicals.
Follow a Balanced Washing Routine
A proper wash routine keeps nappies clean without damaging materials.
Rotate Your Nappy Stash
Using a full day’s worth of nappies and rotating them reduces wear on individual nappies.
Delamination vs Other Causes of Leaks
Sometimes leaks are mistaken for delamination.
Check for these first:
- Poor fit
- Not enough absorbency
- Compression leaks
- Washing issues
- Worn inserts
If the outer shell itself is leaking, delamination is the likely cause.
When to Replace a Cloth Nappy
You may need to replace a nappy if:
- leaks continue through the shell
- waterproof layer is peeling
- nappy stays damp on the outside
- it no longer performs reliably
Replacing damaged nappies ensures your cloth nappy system continues to work smoothly.
Choosing Quality Cloth Nappies
High-quality modern cloth nappies are designed to last through years of use when cared for properly.
At Darlings Downunder, we focus on providing durable cloth nappies and accessories that support families through their reusable parenting journey.
With the right washing routine and care, cloth nappies can remain reliable, practical, and long-lasting.
Final Thoughts
Delamination can be frustrating, but it’s usually preventable with proper care and washing habits.
The key things to remember are:
- avoid high heat
- use a gentle but effective washing routine
- line dry where possible
- rotate your nappies
- replace heavily worn nappies when needed
With the right care, cloth nappies can last for years and continue to provide a practical, eco-friendly alternative to disposables.