Joybuy Insights

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

Choosing baby nappies isn’t just about comparing how many are in a pack. A nappy that’s too big is likely to leak urine, while one that’s too tight can mark the skin and restrict movement. And claims like “hypoallergenic”, “eco-friendly” or “anti-leak” are worth a closer look.

To avoid unpleasant surprises, start by checking the recommended weight, the features that actually matter, and the materials that come into contact with your baby’s skin. Here are the key criteria to consider before buying Pampers nappies, Love & Green nappies, or any other brand.

Common pitfalls when buying baby nappies

1. Relying only on age

Age gives a very general indication, but it’s not enough to determine nappy size. At six months, a baby could be in size 3, size 4, or another size entirely, depending on their weight and build. Weight ranges often overlap, so pay close attention to how the nappy fits around the tummy and thighs.

2. Confusing marketing promises with verifiable features

A claim like “all-night protection” doesn’t guarantee there won’t ever be a leak. The result also depends on the size you choose, how the nappy is positioned, the amount of liquid absorbed, and your baby’s movements. A back pocket, elasticated barriers and an absorbent core are more concrete features to look for.

3. Buying a large pack without checking tolerance first

An economy pack can quickly become a false economy if it causes redness, leaks or a poor fit. For newborn nappies, it’s better to start with a reasonable-sized pack. Test the fit and your baby’s tolerance before building up a big stock, especially when moving from size 1 to size 2.

The essential criteria to check

Weight and fit

Weight guidelines are still the best starting point:

  • Size 0: generally for newborns under 3 kg.
  • Size 1: approximately 2 to 5 kg depending on the brand.
  • Size 2: approximately 3 to 6 kg or 4 to 8 kg depending on the range.
  • Size 3: often around 4 to 9 kg or 6 to 10 kg.
  • Size 4: approximately 7 to 14 kg or 9 to 14 kg.
  • Size 5: often 11 to 16 kg.
  • Size 6: from 13 kg depending on the product.
  • Size 7: for older children, according to the stated range.

Once the nappy is on, the fastenings should feel comfortable, the leg barriers should be properly unfolded, and there shouldn’t be a large gap at the back. Repeated leaks sometimes indicate a poor fit rather than a problem with absorbency.

Absorbency and leak prevention

To choose anti-leak baby nappies, look for an absorbent core, a fast-absorption zone, and well-fitted leg barriers. For night-time, also check that the nappy covers the back properly. Some Pampers products include a “Stop & Protect” back pocket and a wetness indicator. These features can make nappy changes easier, but they don’t replace regular changes.

Night-time baby nappies should not be worn for longer than the manufacturer recommends. Change a soiled nappy promptly and follow the instructions on the packaging.

Composition and certifications

For nappies for sensitive skin, check the elements that come into direct contact with the skin: fragrance, lotion, dyes, natural latex and the inner liner. Claims like “dermatologically tested”, “hypoallergenic” or Standard 100 by OEKO-TEX refer to specific features or processes, but they don’t guarantee that a skin reaction won’t occur.

Eco-friendly nappies may contain FSC-certified cellulose, bio-based materials or recycled packaging. That doesn’t mean the entire nappy is biodegradable or compostable. Check the full composition and the recycling guidelines for your local area.

Our selection by profile

Recommended for: Budget-conscious beginners
LOVE & GREEN Healthy Eco Baby Diapers Size 2

LOVE & GREEN Healthy Eco Baby Diapers Size 2 3-6kg - 36 Diapers

Why this choice suits this profile: This size 2 is suitable for babies from 3 to 6 kg and lets you test a composition that prioritises naturally sourced materials without having to buy a very large pack straight away.

How this product avoids the pitfall

The product page states 0 % lotion, fragrance and dyes, plus an umbilical cut-out for sizes 1 and 2. Still, check your baby’s tolerance.

Main advantage and key features

FSC-certified cellulose, packaging described as recycled and recyclable, wetness indicator not mentioned for this product.

Recommended for: Premium enthusiasts
Pampers Harmonie Diapers Limited Edition Size 4

Pampers Harmonie Diapers Limited Edition, Size 4, 84 Diapers, 9kg-14kg

Why this choice suits this profile: This product may appeal to families looking for a Pampers nappy designed for sensitive skin, with a size 4 suitable for babies from 9 to 14 kg.

How this product avoids the pitfall

The product page mentions dermatological testing, a hypoallergenic design and Standard 100 by OEKO-TEX certification. These describe the product, without guaranteeing it will suit every skin type.

Main advantage and key features

Top sheet described as containing 50 % plant-based ingredients, cellulose from FSC-certified forests and a Stop & Protect back pocket.

Recommended for: Specific uses and heavy users
Pampers Baby-Dry Size 4

Pampers Baby-Dry, Size 4, 124 Nappies, 9-14kg

Why this choice suits this profile: This large pack may suit a family that uses size 4 nappies every day and wants to restock less often.

How this product avoids the pitfall

The wetness indicator and back pocket make it easier to track nappy changes and help reduce leaks, provided you stick to the recommended weight and fit the nappy properly.

Main advantage and key features

124 nappies per pack, fast-absorption core, ComfortTouch outer sheet and size 4 for babies from 9 to 14 kg.

Recommended for: First days and newborn nappies
Pampers Premium Protection New Born Size 1

Pampers Premium Protection New Born Giant Size 1, 44 nappies

Why this choice suits this profile: Its umbilical cord cut-out and size 1, designed for 2 to 5 kg, meet the practical needs of the first few days, depending on your baby’s actual weight.

How this product avoids the pitfall

The umbilical cut-out reduces friction around the tummy. It’s still essential to choose the right size to avoid gaps and leaks.

Main advantage and key features

Stated pack of 44 nappies, wetness indicator, repositionable fastenings and materials without fragrance or natural latex, according to the product page.

Looking for other options?

We’ve put together a full selection, updated in real time, of products that meet these demanding criteria and European safety requirements.

Frequently asked questions about baby nappies

What size nappy should I choose for a newborn?

Go by your baby’s weight rather than their age. A size 0 nappy may suit a newborn under 3 kg, while a size 1 often covers a range of 2 to 5 kg. The nappy should fit around the legs and tummy without being too tight.

How long can a baby wear a nappy at night?

It depends on the nappy’s absorbency, the amount of liquid and the manufacturer’s recommendations. Change a soiled nappy promptly and don’t exceed the time stated on the packaging or instructions. An absorbent nappy-pant can be handy when your baby is more active, but it should also be chosen according to their weight.

Are hypoallergenic nappies suitable for all skin types?

The term “hypoallergenic” generally means the product has been designed to reduce the risk of a reaction, based on the information provided by the brand. It is not an absolute guarantee. If irritation persists, stop using the product and seek advice from a healthcare professional.