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With a YUKA score of 100/100, we are transparent about the composition of our products
All our products are made in France or Europe with natural ingredients
More than 150,000 families trust us ❤️
Language: US
Language: US
Products
Content
0 results
A baby's diaper 👶 is in contact with their skin daily. That’s why choosing the right one is crucial: free from harmful substances, fragrances, and lotions. To prevent leaks and ensure maximum comfort, selecting the correct size is just as important. Size 1, 2, 3, 5, 6… Follow this guide to find the perfect diaper size for your little one!
Before selecting the ideal diaper size, it’s essential to choose the right brand—one that suits your baby’s needs. With so many options available, finding the best diaper can be overwhelming for parents.
Here are key factors to consider:
➡️ The diaper should be free from lotions, fragrances, and harmful chemicals.
➡️ It must be chlorine-free.
➡️ It should guarantee leak protection.
➡️ Toxicological reports should be accessible.
➡️ The diaper’s composition should be fully traceable.
➡️ Prefer short supply chain production.
All diapers are certified as “dermatologically tested” and “hypoallergenic.”
Eco-friendly diapers contain at least 49% natural materials, making them safer for babies and the planet. JOONE diapers, for instance, are FSC-certified, fully traceable, and made in a short supply chain. Their cellulose is T.C.F. certified, meaning it is bleached without chlorine or chlorine-based agents.
Once you’ve chosen the perfect diaper, it’s time to find the right size. Size 1, 2, 3, 4, 5—which one should you pick?
At JOONE, we have created a size guide based on baby weight. Keep in mind that every baby is different. Even if your baby is the same age as your friend’s, they may wear different diaper sizes.
JOONE diapers range from size 1 to size 6, covering newborns to toddlers reaching potty training.
Here’s a quick size chart:
➡️ Size 1: 2 to 4 kg
➡️ Size 2: 3 to 5 kg
➡️ Size 3: 4 to 8 kg
➡️ Size 4: 7 to 14 kg
➡️ Size 5: 10 to 18 kg
➡️ Size 6: 16 to 30 kg
Diaper usage varies based on size rather than age: as your baby grows, they will need fewer diapers per day.
Here are a few signs to check if the diaper size fits well:
➡️ The diaper should not leave marks on the skin but must fit snugly.
➡️ If the diaper is too small, red marks may appear on the inner thighs.
➡️ Baby should be able to move freely without restriction.
➡️ You should be able to slide two fingers between the diaper and baby’s tummy.
➡️ The diaper should not leak.
➡️ Ensure the baby’s bodysuit is not too tight, as it can press against the diaper and cause leaks.
During the last weeks of pregnancy, your doctor may estimate your baby’s weight. This can help you decide which diaper size to pack for the hospital.
If unsure, bring both newborn size and one size up to be prepared in case the newborn size is too small.
"Before heading to the maternity ward, I packed two diaper sizes just in case. I knew weight estimates weren’t always exact, so I preferred to be safe!"
— Lola, mom of Kylian, 16 months
Newborns typically lose up to 10% of their birth weight in the first few days. While some regain it quickly, others may take longer.
"If your baby’s diaper is leaking frequently, especially at night, or leaving red marks, it may be time to size up. My pediatrician recommended switching sizes as soon as my baby reached the upper weight limit for a size. Once I made the change, no more leaks or discomfort!"
— Barbara, mom of Vahina, 20 months
If the diaper feels too tight or doesn’t provide enough coverage, consider moving to the next size. Frequent leaks are also a strong indicator that a size change is needed.
If unsure between two sizes, start with a small pack to test the fit. JOONE offers single diaper purchases so parents can try a size before committing to a subscription. If your baby is close to the upper weight limit, it's often best to size up.
A diaper is too large if it gaps at the thighs, waist, or back. If it doesn't fit snugly to the baby's shape, it’s likely too big.
"I was surprised how quickly my baby needed size 3 diapers at just 2 months old! I didn’t expect to change sizes so fast, but the early months bring rapid growth."
— Valérie, mom of Dany, 8 months
Size 3 is designed for babies weighing 4 to 8 kg. Babies grow fast in their first three months, gaining 800g to 1kg per month and growing 3 to 4 cm. When switching sizes, consider frequent leaks, movement restrictions, and whether the diaper leaves marks.
Size 4 is commonly worn for a longer period, usually between 6 to 18 months. This is because growth and weight gain slow down after 6 months.
Size 5 often marks a transition phase—your baby is starting to walk and move independently. However, every baby is unique and develops at their own pace.
A flexible subscription allows you to adjust diaper sizes whenever needed. At JOONE, parents can easily change diaper sizes in their subscription. If they have unopened packs of smaller diapers, JOONE refunds them if they are less than 6 months old. Manage returns directly in your account under “My Orders.”
As your baby grows and gets closer to potty training, you may notice:
➡️ They resist lying down for diaper changes.
➡️ They wiggle and move constantly.
➡️ They remove their diaper frequently.
➡️ They start telling you when their diaper is wet.
This is a great time to introduce pull-up diapers!
Pull-ups help babies gain independence and transition from diapers to real underwear. They provide the comfort and flexibility needed for movement and potty training.
Like regular diapers, pull-up sizes depend on weight. JOONE offers the following sizes:
➡️ Size 4: 8 to 14 kg
➡️ Size 5: 12 to 18 kg
➡️ Size 6: 16 to 30 kg
On average, babies need:
➡️ 6-8 diapers/day (first 6 months)
➡️ 5 diapers/day (6-12 months)
➡️ 3-4 diapers/day (1-2 years)
➡️ 2-3 diapers/day (2-3 years)
These numbers help parents estimate diaper needs and adjust subscriptions accordingly.
➡️ Ensure the wings are properly positioned.
➡️ Check that leg cuffs are pulled out to prevent leaks.
➡️ Fasten the adhesive tabs securely.
➡️ Adjust the diaper to fit snugly around the baby’s waist.
For baby boys, ensure their private part is pointing downward before fastening the diaper to prevent leaks.
A proper diaper fit is essential, but so is frequent changing. Regular diaper changes help prevent rashes and irritation. Change your baby’s diaper after every bottle feeding or nursing session. 👩🍼🤱