Size changes in nappies matter more than most parents realise. If your baby is leaking more often, waking up wet, or showing red marks around the waist, it’s usually not the brand it’s the size. Size 4 nappies are one of the most commonly used stages because they support babies through a big leap in movement, growth, and development.
This blog breaks down everything you need to know about size 4 nappies so you can choose confidently, avoid waste, and keep your baby comfortable day and night.
What Are Size 4 Nappies?
Size 4 nappies are designed for babies and toddlers typically weighing 8–14 kg. This stage usually includes crawling babies, early walkers, and highly active toddlers who need nappies that move with them while offering reliable absorbency.
Parents choose size 4 nappies because they:
- Offer stronger absorbency than smaller sizes
- Fit growing waists and thighs better
- Reduce leaks during movement and sleep
- Work well for both day and overnight use
When Should You Switch to Size 4 Nappies?
Many parents wait too long to size up. The right time to move into size 4 nappies is when you notice:
- Frequent leaks, especially at night
- Tight marks on the waist or legs
- Baby outgrowing size 3 too quickly
- Increased movement like crawling or walking
Sizing up early often solves leak issues instantly.
Why Size 4 Nappies Are So Important
This is the stage where babies stop staying still. Size 4 nappies are built for motion.
Key benefits include:
- Better leg seals for crawling and walking
- Improved absorbency for heavier wetting
- Flexible waistbands for comfort
- Stronger leak guards for overnight use
A poor fit at this stage causes frustration for both parents and babies.
Types of Size 4 Nappies Available
Disposable Tape Nappies
These are the traditional option.
- Adjustable tabs
- Suitable for daytime use
- Ideal for babies who lie down during changes
Size 4 Nappy Pants
Pull-up style nappies designed for active babies.
- Easy to pull on
- Stretchy waistband
- Ideal for daycare and standing changes
Many parents transition to pants once their baby starts walking.
Reusable Size 4 Cloth Nappies
An eco-conscious alternative.
- Adjustable sizing
- Long-term cost savings
- Gentle on sensitive skin
Reusable nappies are often used alongside disposables for flexibility.
Absorbency: What to Expect from Size 4 Nappies
At this stage, babies:
- Drink more fluids
- Sleep longer stretches
- Stay dry less often
High-quality size 4 nappies are designed with multi-layer absorbent cores that:
- Lock moisture away quickly
- Reduce overnight leaks
- Keep skin dry for longer
If night leaks persist, look for overnight-specific size 4 nappies.
Size 4 Nappies and Sensitive Skin
Skin sensitivity often appears during this stage due to:
- Longer wear times
- Teething
- Increased moisture
Choosing breathable, fragrance-free size 4 nappies helps:
- Reduce nappy rash
- Improve airflow
- Minimise irritation
Correct sizing is just as important as materials when it comes to skin health.
Size 4 Nappies vs Size 5 Nappies
| Feature | Size 4 Nappies | Size 5 Nappies |
|---|---|---|
| Weight range | 8–14 kg | 12–17 kg |
| Best for | Crawlers & early walkers | Older toddlers |
| Absorbency | High | Higher |
| Fit | Snug & flexible | Roomier |
If leaks happen but size 4 still fits comfortably, try a different style before jumping to size 5.
Common Mistakes Parents Make with Size 4 Nappies
- Buying too many before checking fit
- Choosing price over performance
- Ignoring overnight absorbency needs
- Staying in a smaller size too long
The right size reduces stress, laundry, and sleep disruption.
Buying Size 4 Nappies Online
Online shopping makes it easier to compare brands, styles, and value packs.
Explore trusted options here:
These resources help parents choose nappies based on fit, comfort, and performance — not just price.
Sustainable Nappy Choices at This Stage
As nappy usage peaks around size 4, many parents consider sustainability. Whether disposable or reusable, responsible manufacturing matters.
To understand more about sustainable product solutions and packaging practices, explore:
https://sandsindustries.com.au/
Small choices add up over time.
How Long Will My Baby Stay in Size 4 Nappies?
Most babies wear size 4 nappies for several months, depending on:
- Growth rate
- Body shape
- Activity level
Because this size lasts longer than earlier stages, it’s often the best one to buy in bulk — once you confirm the fit works.
Final Thoughts: Are Size 4 Nappies the Right Choice?
Yes size 4 nappies are a critical stage that supports your baby’s growth, movement, and sleep. With the right fit and absorbency, they dramatically reduce leaks, improve comfort, and make daily routines easier.
If your baby is active, growing fast, and sleeping longer, size 4 nappies are not just appropriate they’re essential.
Looking for the Best Size 4 Nappies for Your Baby?
Explore helpful guides, product options, and parent resources at: