Diaper size 3: up to what age or weight?

Is your baby still growing fast in the first few weeks of life, and will size 2 diapers soon no longer fit? You're wondering at what weight he can start wearing a size 3 diaper? When should he go up a size?

Everything you need to know about size 3 diapers

Size 3 diapers are designed for babies weighing between 4 and 9 kg. They can be worn from 3 months up to around 5 or 6 months. After the first three months of life, baby's growth and weight gain tend to slow down.

Generally speaking, size 3 diapers can be worn longer than previous sizes.

When should I start wearing size 3 diapers?

There are certain signs that can't fool you. It's time to move up to the next size of protection when :

• Urine or stool leakage is frequent;
• The absorbent surface is not large enough for your baby's size;
• The bottom is no longer fully covered by the diaper;
• The diaper leaves red marks on your baby's skin, thighs and tummy;
• If the adhesives are difficult to close and even tend to peel off.

When diaper features are no longer functional and diaper management is complicated, it's time to change. These are signs that your baby's diaper is too small and that it's time to switch to the next size up.

How many size 3 diapers should I buy for my baby?

As explained above, a size 3 diaper will be used a lot more than a size 1 or 2 diaper. You can therefore carry a larger stock of diapers, without too much risk of not using them. Opt for a subscription which will allow you to have packs or batches of diapers delivered every month. A subscription will enable you to stock up and manage your diapers more effectively. Plan to renew your subscription regularly to get the best prices and the right size of diapers delivered.

Depending on your child's weight, you'll need a different number of diapers. Keep an eye on your stock so you don't find yourself without diapers or with too many.

The number of diapers you need will depend on your baby's weight, height and morphology! You can refer to our guide below:

How to choose the best size 3 diaper?

Beyond choosing the right size diaper for your baby, you also need to make sure that the diaper you give your baby is healthy for his or her skin. From birth to potty training, your baby will be constantly in diapers.

Your baby's diapers must therefore be perfectly absorbent and harmless. Choose diapers made from ecolabelled materials.
To do this, you need to make sure that the diapers do not contain toxic chemicals, endocrine disruptors, etc., which could cause irritation, redness, diaper rash and other discomforts for your baby. To do this, you need to know the composition of the different layers of your baby's diaper: the contact layer, the absorbent material, the leak-proof material, the outer material, etc...

You should also have easy access to analysis reports. If they're not available, don't bother - a lack of transparency about product composition is never a good sign.

You should also be wary of false marketing claims or claims that are not based on reliable information. Certain terms, such as hypoallergenic and dermatologically tested , are mandatory for diapers and panty liners.

Refer to whitening methods. Most diapers today are bleached using the ECF (Elementary Chlorine Free) method, which uses chlorine derivatives that are toxic to baby's skin. Only 5% of baby diapers today are bleached using the TCF (Totally Chlorine Free) method, which uses neither chlorine nor chlorine dioxide. One of the most important certifications for your child's health and respect for the environment is the FSC ecolabel. It ensures respect for cotton fields and forests, and avoids the use of chemicals.

Several studies have been published by consumer associations and the ANSS, warning of the safety of diaper compositions.

As for the disposable vs. cloth diaper debate, both have their advantages and disadvantages. Cloth diapers are more ecological, but in terms of cleanliness and risk of irritation, disposable diapers are preferred. A reusable product will always be more durable, but in this case, your child's comfort will be less. The materials used will be less absorbent than a premium ecological diaper.

From your baby's 6th month of life, his weight gain continues to slow down. Here are a few signs that should indicate that it's time to switch to the size 4 diaper !