Joybuy Insights

Baby nappies: how to choose the right size, absorbency and format

Choosing baby nappies isn't simply about comparing the price of packs. A poorly fitted nappy can cause leaks, while a large stock bought too early may no longer suit your child's shape. And claims like "ultra-absorbent", "hypoallergenic" or "eco-friendly" deserve a closer look.

Here are the criteria to check before you order, along with a selection suited to different needs and budgets.

Common pitfalls when buying baby nappies

1. Relying on age rather than weight

The age sometimes shown on packs is only a guide. To choose the right size, go by your child's weight first, then their shape and how the nappy sits.

In this selection, the typical weight ranges are as follows:

  • Baby nappies size 1: approximately 2 to 5 kg.
  • Baby nappies size 3: approximately 6 to 10 or 11 kg.
  • Baby nappies size 4: approximately 9 to 14 kg.
  • Baby nappies size 5: approximately 11 to 16, 17, 18 or up to 25 kg depending on the model.
  • Baby nappies size 6: generally intended for children heavier than those wearing a size 5.
  • Baby nappies size 7: designed for children who still need nappies at a higher weight.

A nappy that is too large will gape at the legs or back. One that is too small will press into the skin, restrict movement and reach its absorbency limit more quickly.

2. Taking marketing promises as guarantees

"All-night protection" does not mean no leaks will occur, whatever the circumstances. The result depends on the size chosen, the volume of liquid, your child's position and how often you change them.

It is better to look at the product's concrete features:

  • wetness indicator that changes colour;
  • elastic leg barriers;
  • back pocket or rear reinforcement;
  • absorbent core containing superabsorbent polymers;
  • repositionable fasteners or stretchy waistband.

Anti-leak nappies give the best results when the barriers are properly unfolded and the nappy fits snugly around the hips.

3. Buying a large pack without working out the real price

A pack of 168 nappies may look like a bargain, but the real measure is the price per nappy, not the total amount shown. With a newborn, their shape changes quickly: a large stock of baby nappies size 1 can become unusable before you have even finished it.

For more long-lasting sizes, such as sizes 4 and 5, family packs and monthly formats can offer better value. Store them in a dry place, away from heat and moisture.

The technical criteria to check

The fit and size

A good nappy should stay in place without being tight. After putting it on, check:

  1. that the leg elastics are fully unfolded;
  2. that the fasteners are positioned symmetrically;
  3. that the waistband sits around the waist without rolling;
  4. that you can slip a finger between the nappy and the skin.

Repeated leaks at the back may mean the size is too small or the nappy is poorly positioned. If red marks persist, the fit may be too tight or your child's skin may be particularly sensitive.

Absorbency and the wetness indicator

The absorbent core usually combines cellulose with SAP, a superabsorbent polymer. This combination holds liquids effectively, but it does not mean you can skip regular changes.

Baby nappies with a wetness indicator are especially handy for newborns and when you are out and about. Depending on the model, one or more lines become more visible when wet. This signal tells you it is probably time to check the nappy; it does not replace a direct check.

Composition and labels

For nappies for sensitive skin, check whether they contain any perfume, lotion or natural latex. Also look at the information about dermatological testing if the manufacturer provides it.

Hypoallergenic nappies aim to limit certain irritants, but no formula suits every child. If redness persists, stop using the product and ask a healthcare professional for advice.

Eco-friendly nappies may contain FSC-certified cellulose, renewable raw materials or be sold in recycled packaging. However, these features should not be confused with a general guarantee of lower environmental impact: a nappy is still a disposable product.

Our selection by profile

Recommended for: beginners on a tight budget
Bc Babycare Royal Nappies Size 1 (2-5 kg) 68 Pack

Bc Babycare Royal Nappies size 1 (2-5 kg), pack of 68

Why this choice fits this profile: With 68 baby nappies size 1, this pack lets you try them out with a newborn weighing 2 to 5 kg without ending up with a huge stock.

How this product avoids the pitfall

The weight range is clearly stated and the three indicator lines make it easier to track changes, without relying solely on how many nappies are left in the pack.

Main advantage and key features

Stated pH of 5.5 on the surface, thin absorbent core, elastic waistband and claimed 360-degree protection.

Recommended for: premium seekers
Pampers Harmonie Diapers Limited Edition, Size 5, 72 Diapers

Pampers Harmonie Diapers Limited Edition, size 5, 72 nappies, 11 to 16 kg

Why this choice fits this profile: This product is for parents who want a Pampers size 5 nappy, with a detailed composition and a pack of 72 units.

How this product avoids the pitfall

The product page states it is free from lotions and colourants, and that the top sheet is made from 50% plant-based ingredients.

Main advantage and key features

Wetness indicator, rear Stop & Protect pocket as per the manufacturer, cellulose from FSC-certified forests and claimed OEKO-TEX Standard 100 certification.

Recommended for: specific and heavy use
LOVE & GREEN Hypoallergenic Eco Baby Diapers Size 5

LOVE & GREEN Hypoallergenic Eco Baby Diapers size 5, monthly pack of 160 nappies

Why this choice fits this profile: Its four packs of 40 nappies suit families who regularly use size 5 for a child weighing 11 to 25 kg.

How this product avoids the pitfall

The total number of nappies and the weight range are shown separately, which helps you calculate the unit price and avoid poorly suited formats.

Main advantage and key features

71% organic ingredients claimed, absorbent pad made from FSC and TCF cellulose, free from lotion and perfume according to the product page.

Looking for other options?

We have put together a comprehensive, real-time selection of products that meet these demanding criteria, while also taking European safety regulations into account.

Which nappy to choose depending on the stage of use?

For the first few days, compare baby nappies size 1 that feature a umbilical cut-out and a wetness indicator. As your child grows, baby nappies size 3, then size 4, become the most common. Size 5 is often the go-to for buying in bulk.

Children who are starting to move around may be more comfortable with baby nappy pants, especially during potty training or for standing changes. The Pampers Baby-Dry Pants and Love & Green models in size 5 have a stretchy waistband and are easier to pull on and off than a traditional taped nappy.

For sizes 6 and 7, pay particular attention to the width of the waistband, the roominess around the legs and whether the pack size covers your child's actual needs. A larger size is not necessarily more absorbent if it is not fitted properly.

Frequently asked questions about baby nappies

How long can you keep a pack of nappies?

Keep nappies in their packaging, in a clean, dry place away from heat sources. Check any batch or storage information on the pack. A nappy that is misshapen, torn or has visible absorbent material should not be used.

When should you move up a size?

Move up to the next size when the fasteners are at their limit, the elastics leave marks on the skin, or leaks become frequent despite correct positioning. Start by going by weight, then check how the nappy sits on your child.

Are hypoallergenic nappies suitable for all sensitive skin?

They can reduce the presence of certain ingredients that may irritate the skin, but they are not a universal guarantee. Check the composition, change your child regularly and stop using the product if irritation appears or persists.