As parents, we all want to make sure our little ones are dry, comfy, and rash-free. But as babies grow, their needs change, especially when it comes to nappy sizes. So how do you know when it’s time to size up your baby’s nappies?

If you're experiencing more leaks, red marks, or awkward nappy fits, you're not alone. Here's your go-to guide to figuring out the right nappy size, so you can keep your baby smiling and sleeping through the night.

👶 1. Leaks and Blowouts Are Happening More Often

No one likes waking up to a wet cot or a blowout during a grocery run. One of the first signs that your baby has outgrown their current nappy size is an increase in leaks. A well-fitting nappy should be able to hold everything in - especially overnight. If your baby is waking up in soggy clothes, it might be time to move up to the next size nappy.

💡 Pro tip: Many parents switch to size 3 nappies once their baby hits around 6kg, especially during the crawler stage when movement increases.

🩲 2. Red Marks Around Waist or Thighs

Check your baby’s skin after changing. If there are red indentations or pressure marks around the thighs or tummy, the nappy might be too tight. While a snug fit is important to avoid leaks, too tight can lead to discomfort or even mild irritation.

Remember, comfort matters - especially when your baby is wearing nappies 24/7. A better-fitting, breathable nappy like Cuddlies bamboo nappies can make all the difference.

📏 3. The Tabs Aren’t Landing Where They Should

Tabs should easily reach the centre of the waistband without pulling or stretching. If you're struggling to get the tabs in the right place or they keep popping open, it's a strong sign your baby is ready for a bigger nappy.

Well-positioned tabs help ensure a secure fit, prevent leaks, and make sure your baby can move freely - especially if they’re in the crawler nappies stage.

📈 4. Your Baby’s Weight Is at the Top of the Size Range

Most nappy brands list recommended weight ranges for each size. If your baby is at or near the top end of the range - or exceeding it - it’s best to size up. Growth can happen quickly, and staying in a smaller size too long can affect absorbency and comfort.

For instance, if your baby is around 8kg and still in size 2, transitioning to size 3 nappies can give them more space and better leak protection.

💤 5. Interrupted Sleep or Fussiness

Is your baby suddenly waking up more during the night? While many factors can disrupt sleep, a too-small or leaky nappy can be a hidden culprit. An upgrade in size (and quality) can help your little one sleep better - and give you back some rest too.

💚 Why Choose Cuddlies Bamboo Nappies for Sizing Up?

Our Size 3 Crawler Nappies are thoughtfully designed for babies 6–10kg who are on the move. Here’s why they’re a hit with Aussie parents:

• ✅ 100% Bamboo top and bottom sheets: ultra-soft and breathable

• ✅ No nasties: chlorine-free, fragrance-free, no latex or phthalates

• ✅ Super absorbent core: holds up to 900ml for all-day and overnight dryness

• ✅ Flexible fit: contoured waistband and stretchy tabs for active bubs

• ✅ Eco-friendly: biodegradable* under 100 days with proper disposal

*Refer to our website for disposal guidelines to support biodegradability.

🛒 Ready to Move Up?

If your little one’s showing signs of outgrowing their current nappies, don’t wait. Switching to the right size can prevent leaks, reduce irritation, and make everyone’s day (and night) a little smoother.

Explore the full Cuddlies Nappy Size Guide to find the perfect size for your bub and make the switch with confidence.

👉 Explore Cuddlies Nappies
Designed to grow with your baby - because happy bums mean happy homes.