Size 5 diaper: up to what age or weight?

In collaboration with Rokiyah Hosen Professional proofreading


Your baby is starting to walk and is showing signs of wanting to do everything on his own. And for some time now, you've been feeling that your baby's diapers are too small .

You're wondering s'isn't it time to upgrade to the next size up: size 5? How much does your baby need to weigh to move up to this size? Should you use diapers or pants? We answer all your questions in this article.


All you need to know about size 5 diapers

The size 5 diaper is suitable for babies weighing between 11 and 25kg. It is estimated that a baby can wear it from 18 months onwards. Of course, it all depends on your baby's morphology. Some babies will switch to a size 5 diaper as soon as they blow out their first candle.

Like the size 4 diaper, the size 5 is worn for several months by your baby.

When should I start using size 5 diapers?

To know when to choose the next diaper size, you have to rely on several things, if :

  • You are experiencing recurring leaks;
  • You can no longer fit two fingers between the diaper and your baby's tummy;
  • You notice red marks on your baby's skin when you change his diaper;
  • You have trouble closing lyour baby's diaper;
  • Your baby makes you feel that his diaper is too small, for example by pulling on it.

All these indicators should let you know that the diaper size and that it's time for a new one.

How many size 5 diapers should I buy for my baby?

As with size 4, size 5 is a diaper size that will be worn for a long time. Don't be afraid to store several packs of diapers in this case. They will be used.

Below is a summary of the number of packs of diapers to buy according to baby's weight and age l: 


Number of packages in size 4

Number of packages in size 5

Number of packages in size 6

from 10.5 to 12.5 kg



from 12.6 to 13 kg


from 13.1 to 13.5 kg



+ over 13.5kg


If you're wondering whether you'd be better off with panty diapers rather than size 5 diapers, they have both advantages and disadvantages: they're easier to put on and take off. Panty diapers are particularly suitable for potty training.

Depending on your child's development, potty training is thought to start around the age of 2. So, if your baby is still under the age of 2, it's best to stick with diapers.

Once he's had his second birthday, it will be easier to potty train him. At that point, it's a good idea to switch to diapers or training pants.

At night, however, it's best to stick with conventional diapers.

How to choose the best size 5 baby diaper?

As well as choosing the right size diaper, it's important to choose a good quality diaper that's soft and comfortable for your baby, and above all, healthy.

Your baby's skin is very fragile and is in direct contact with his skin.

To ensure that a diaper is healthy and made of skin-friendly materials, there are several criteria to consider: 

  • First of all, you can consult the chemical analysis results of diaper brands. You need to make sure they don't contain toxic products. If you can't access the analyses, it's a bad sign;
  • Beware of claims such as "dermatologically tested", "hypoallergenic" or "FSC certified". These terms are compulsory, but in no way guarantee that the diapers are non-toxic;
  • Then check the diaper's composition in detail to make sure it doesn't contain substances such as perfume, lotions, allergies and irritations. Also check that the diaper's elastics are latex-free;
  • You can also check the bleaching method used. Today, the majority of diapers are bleached using the ECF (Elementary Chlorine Free) method, which uses chlorine derivatives, and only 5% of diapers on the market use the TCF (Totally Chlorine Free) method, which uses neither chlorine nor chlorine derivatives;
  • It's also advisable to choose ecological or organic disposable diapers rather than conventional ones. Ecological or organic diaper brands are generally more careful in their choice of raw materials and manufacturing processes. The more natural materials a diaper contains, the better.

There's a misconception that eco-friendly diapers absorb less. But this is totally false: organic and/or ecological diapers absorb as well as, or even better than, disposable diapers.

Ecological diapers actually reduce the concentration of synthetic material in the absorbent part, replacing it with natural cellulose.

Baby's growing: when to change to a size 6 diaper?

Your baby is still growing and you're wondering whether it's time to switch to size 6 diapers

As for going from size 4 to size 5, if you notice regular leaks, red marks on your baby's skin, and if you can no longer fit two fingers between the diaper's elastic and your baby's tummy, it means it's time to go up a size.

To potty train your baby, we recommend the use of training pants. They work on the same principle as diapers, but allow you to reduce waste considerably. 


You may also like :