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Babies come in all shapes and sizes, and it’s essential to find the right nappy if you want a happy baby and happy parents. Nappy size charts are a handy guide to what nappies to buy, but you may find the process involves a bit of trial and error as you work out what suits your baby best.

When to go up a nappy size

If nappies are leaking it’s usually a sign that you need to go up a size. Other indicators are nappy rash that develops at night – because smaller sizes are less absorbent and hold the damp fabric close to your baby’s skin. And of course if there are red marks where the nappy sits across your baby’s tummy that shows it’s become too tight. At first, buy just a small pack of the next size, to be sure you’ve made the right decision.

If nappies are leaking poo, however, it’s almost definitely time to go up a size!

Weight or shape?

Sometimes the shape of your baby is more important that his weight, and parents of long, slim babies can find that nappies leak wee because the weight of a wet nappy pulls it away from the legs. In this case, you may find going back down a size (and changing more often if necessary) could be the answer.

Stop the leaks

When the nappy is leaking around the legs, it may be you need a higher absorbency rather than a bigger size. In this case, choose a plus-size nappy. These are the same size as a standard nappy (so 4+ is the same size as a 4), but are more absorbent, making them great for night-time use or for babies that wee more.

Also check you’re fastening the nappy properly – not too tight, but snug enough to stop leaks, and with the tabs at the right angle. Sometimes tiny adjustments can make all the difference. And make sure baby boys’ willies are pointing down when you put them in a clean nappy!

It’s always worth experimenting with different brands of nappy, as they all have slightly different shapes and rates of absorbency.

Tesco Loves Baby nappies are available from Newborn Size 1 (2-5kg) right up to Junior Size 5 (11-25kg) 

Now you’ve got the nappy sorted, read our guide to everything you need to know about nappy rash and how to deal with it at change time. Then, to get more tailored advice to your baby’s age and stage, remember to sign up to Tesco Baby Club.


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