Medium (4-8kgs)

Size 3 infant nappies cover a significant window of your baby's development from the later newborn weeks at around 4kg right through to approximately 6–8 months for an average-weight baby. This is a stage of rapid growth, increasing mobility, and a baby who is becoming more curious, more active, and considerably harder to keep still during nappy changes. The right medium nappy fits securely, absorbs reliably, and moves with your baby through every kick, roll, and wriggle

Is Your Baby Ready for Size 3 Medium Nappies?

The transition from size 1-2 to size 3 nappies is one of the first nappy sizing milestones Australian parents navigate and getting the timing right saves a lot of leaks and discomfort

Signs your baby is ready to move up to size 3 medium nappies:

• Their size 2 nappy is leaving red marks around the legs or waist after removal
• The nappy is leaking despite being correctly and securely fastened
• The tabs are fastening close to or beyond the centre leaving very little room to tighten further
• Your baby has reached or is approaching 6kg
• The nappy looks visibly tight or is bunching and pulling around the legs

When any of these signs appear, it's time to make the move. A size 2 nappy that fits correctly will sit flat against your baby's body, fasten comfortably in the middle of the tab zone, and leave no red marks after wear

What to Look for in a Size 3 Medium Baby Nappy

At the size 3 infant nappy stage, your baby is going through significant developmental changes starting to roll, reaching for toys, kicking with increasing enthusiasm, and spending more time in tummy time and on the floor. A quality medium baby nappy needs to keep pace:

Flexible fit for active babies — as your baby becomes more mobile, a nappy that fits securely without restricting movement becomes increasingly important. Look for medium nappies with flexible, stretchy side panels and soft leg cuffs that move with your baby without gapping or pulling during rolling and active play

Reliable leak protection — at this stage babies are feeding more varied volumes and the contents of a nappy can be harder to predict. A quality size infant nappy with a well-designed absorbent core and snug leg cuffs keeps everything contained through active days and overnight

Soft, skin-safe materials — baby skin remains sensitive well beyond the newborn stage. Choose medium nappies free from fragrances, chlorine bleaching, and harsh chemical additives particularly if your baby has eczema-prone or sensitive skin

Overnight capability — many Australian parents find their baby starts sleeping in longer stretches at this stage. A size 3 nappy that absorbs reliably through the night without leaking or causing discomfort is essential for protecting those precious longer sleep windows

Eco credentials — if you've been thinking about making the switch to eco nappies, the size 3 medium nappy stage is a great time to start. Ecoriginals offer a brilliant plant-based, biodegradable alternative at this size performing comparably to conventional nappies with a significantly lower environmental footprint

Our Medium Nappy Brands

Moomin Baby — Soft, Joyful & Reliably Fitted

Moomin Baby size 3 medium nappies bring the beloved Moomin characters to every change adding a touch of Scandinavian joy to the many hundreds of nappy changes that the medium stage involves. But it's not just about the design. Moomin Baby nappies are made with soft, skin-friendly materials and reliable absorbency that Australian parents trust through the active, rapidly growing baby months

At this stage your baby is changing fast physically, developmentally, and in terms of what their nappy needs to handle. Moomin Baby size 3 nappies are designed to keep pace, with a flexible fit that accommodates rolling and active floor play, reliable overnight absorption, and the consistently soft lining that protects baby skin through 6–8 changes every day

Moomin Baby size 3 medium nappies feature:

• Soft, skin-friendly inner lining gentle on sensitive and active baby skin
• Reliable absorbency with moisture lock-away for both daytime and overnight use
• Flexible fit with soft leg cuffs that move with your baby through rolling and active play
• Secure, adjustable tab fastening for a snug, comfortable fit from 4–8kg
• Beloved Moomin character prints a design detail that makes every change a little more enjoyable
• Free from harsh chemical additives for skin-safe everyday use

Marquise — Trusted Australian Quality at Every Stage

Marquise is one of Australia's most trusted and long-established baby brands and their size 3 medium nappies bring the same commitment to quality, softness, and reliable performance that Australian families have relied on from Marquise across every stage of babyhood

For Australian parents who want a straightforward, quality medium baby nappy from a brand they know and trust Marquise size 3 nappies are the dependable, no-fuss everyday choice that delivers consistent comfort and leak protection through the active baby months

Marquise size 3 medium nappies feature:

• Soft, comfortable materials gentle on baby skin from 4–8kg
• Reliable fit with secure tab fastening and snug leg cuffs for dependable leak protection
• Consistent Australian quality from one of the country's most trusted baby brands
• A practical, reliable everyday medium nappy choice for Australian families who value trusted quality

Ecoriginals — Australia's Favourite Eco Nappy at Size 3

For Australian parents who want the convenience of a disposable nappy with a significantly lower environmental footprint, Ecoriginals size 3 medium eco nappies are the standout choice. Made in Australia and certified by the National Asthma Council's Sensitive Choice program, Ecoriginals are the eco nappy that doesn't ask you to compromise on performance

The size 3 medium nappy stage is one of the most nappy-intensive periods of your baby's life babies in this weight range are typically changed 6–8 times per day. That's a lot of nappies heading to landfill if you're using conventional disposables. Ecoriginals eco nappies break down significantly faster than conventional nappies, are made from plant-based materials, and are certified free from chlorine, fragrances, and harsh chemicals making them one of the most responsible nappy choices for Australian families and the planet

Ecoriginals size 3 medium eco nappies feature:

• Plant-based, sustainably sourced materials certified free from chlorine, fragrances, and parabens
• Biodegradable construction that breaks down significantly faster than conventional disposable nappies
• Certified by the National Asthma Council's Sensitive Choice program — ideal for babies with sensitive or eczema-prone skin
• Reliable absorbency and leak protection that performs comparably to leading conventional nappy brands
• Soft, comfortable fit from 4–8kg for active, growing babies
• An eco-conscious choice that reduces your family's environmental footprint without compromising on performance

How Many Size 3 Medium Nappies Do I Need?

Babies in the size 3 medium nappy stage typically go through 6–8 nappy changes per day. Here's a practical stocking guide:

Weekly usage: approximately 42–56 nappies per week. Recommended stock: 2–3 packs of size 3 medium nappies at a time enough to avoid running low without over-investing before your baby moves up to size 4

Storage tip: keep one pack at your main change station, one in your nappy bag, and one spare in the cupboard for those moments when you run low unexpectedly

When to move up to size 4: move up from size 3 to size 4 nappies when your baby approaches 8kg, when you notice red marks around the legs or waist, or when the nappy starts leaking despite being correctly fastened

Overnight Nappies at the Size 3 Stage

The size 3 medium nappy stage often coincides with the exciting and exhausting period when Australian babies start consolidating their sleep into longer overnight stretches. This is wonderful news for sleep-deprived parents, but it also means your baby's nappy needs to perform reliably through longer periods without a change

Tips for overnight nappy success at size 3:

• Choose a medium nappy with strong overnight absorption both Moomin Baby and Marquise are designed for reliable overnight performance
• Consider sizing up for overnight use if your baby is approaching the upper weight limit of size 3 a slightly larger nappy has additional absorbent capacity
• Apply a thin layer of barrier cream before the overnight nappy to protect skin through longer wear
• Check the fit of your overnight nappy before settling baby the leg cuffs should sit flat against the skin without gapping

Frequently Asked Questions

What size nappies do I need for a 4–8kg baby?
Size 3 medium baby nappies are designed for babies weighing approximately 4–8kg. This typically covers babies from around 6–10 weeks of age through to approximately 6–8 months, though every baby grows at their own pace. Always check the individual brand's weight guide and move up a size when the current nappy begins to leave marks or leak

What is the best size 3 medium nappy in Australia?
Moomin Baby size 3 nappies are a popular choice for their softness and beloved design. Marquise size 3 nappies are a trusted Australian quality everyday choice. Ecoriginals size 3 eco nappies are the top choice for environmentally conscious Australian families. Browse the full range at Baby Central to compare and find your perfect fit

What are eco nappies and are they worth it at size 3?
Eco nappies like Ecoriginals are made from plant-based, biodegradable materials significantly gentler on the environment than conventional disposable nappies and certified free from harsh chemicals for sensitive baby skin. At the size 2 medium nappy stage, with 6–8 changes per day, making the switch to eco nappies has a meaningful environmental impact. Ecoriginals perform comparably to leading conventional nappy brands making them an easy switch for Australian families

When should I move up from size 3 to size 4 nappies?
Move up from size 3 to size 4 nappies when your baby reaches or approaches 8kg, when you notice red marks around the legs or waist after removing the nappy, or when the nappy begins to leak despite being correctly fastened. When in doubt, go up a size

Are Ecoriginals eco nappies available in size 3 in Australia?
Yes — Ecoriginals size 3 medium eco nappies are available at Baby Central with free delivery on orders over $99 Australia wide. They are one of the most trusted eco nappy brands in Australia for their plant-based materials, Sensitive Choice certification, and reliable performance

How do I know if a size 3 nappy fits correctly?
A well-fitting size 3 medium nappy should lie flat against your baby's body, fasten comfortably in the middle of the tab zone, have leg cuffs that sit snugly without gapping or digging in, and leave no red marks after removal. If any of these conditions aren't met, try adjusting the fit or consider moving up to size 3 nappies

Free delivery on orders over $99 Australia wide. Shop with confidence — Baby Central is Australia's trusted baby specialist, with expert team members available to help you find the right infant nappies for your growing baby