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The Ultimate Diaper Size & Fit Guide

Babies come in all different (adorable) shapes and sizes. From speaking to new and expectant parents every day, we know the kinds of questions you are likely to have, especially when it comes to diapers! So if you are wondering how many diapers to buy in what size at what age, how often to change them and how to achieve the best fit for optimum comfort and dryness, read on for all the answers.

What nappy size does a newborn need?

What diaper size does a newborn need?

If you are unsure what size of diaper to pack in your hospital bag, you are not alone. Many parents try to be super prepared by taking into consideration bump’s projected birth weight. The truth is that more often than not, baby’s actual weight will be much higher or lower. But don’t worry! This does not need to be complicated! Most newborns will fit into size 1 diapers for the first few weeks of their lives. Our size 1 comes with umbilical cord cut outs to ensure that the diaper does not sit on top of your little one’s umbilical stump. All of this makes size 1 the ideal choice for your hospital bag.

How many diapers does a newborn need?

This is a question we hear a lot. We offer a diaper subscription service and it can be a bit daunting deciding on quantities before you have met your little person.

As with all parenting-related matters, there is no black and white answer to this question. Approximately, you can expect to go through around 8-10 diapers per day with your newborn. As baby grows, this will reduce slightly.

We always advise our customers to go with our standard subscription bundle of 4 packs. This will give you an indication of how quickly you go through a pack and a chance to either add another pack or change your delivery frequency. When you find yourself running low, you can always bring your next delivery forward.

How many diapers per day for older babies or toddlers?

You can expect to go through around 6 diapers per day for babies and around 5 for toddlers.

How many nappies per day for older babies or toddlers?
Image: @the_photographer_mama

How do I choose the best size?

Choosing the best size for your little one can seem a little bit overwhelming, particularly because weight brackets overlap so much. But don’t worry, it’s not as complicated as it may seem!

Diaper sizes are based on weight. If it’s been a while since your last health visitor check up, just weigh your baby using bathroom scales. Step on the scales holding your little one and then subtract your own weight.

Since weight brackets overlap so much, you will likely have a choice between two different sizes. When in doubt, always go for the bigger option. The bigger the size, the better the absorbency. Buying the bigger size means no risk whatsoever because even if it’s still very spacious now, your little one will grow into it before you know it. Don’t panic if the diaper seems massive on your baby when you have sized up! You will soon get used to it. Simply use the tabs to adjust the fit around the waist and overlap them if necessary for a snug fit.

Finally, remember that weight guides should be considered as such - guides. Every single baby is different so if the suggested size seems too big or small to you, don’t be afraid to march to the beat of your own drum.

How do I choose the best size?

What size for what age?

It’s important to remember that diaper sizing does not depend on age. It doesn't even entirely depend on weight but rather on the specific needs of your little one. It depends on the specific needs of your little one and nothing else. This article will give you all the information you need to ensure that you get the best possible fit and absorbency for your baby. However, as a general rule of thumb, we have compiled the approximate age range for every size in the above table.

Once your little one gets a little bit more mobile (or less patient during those diaper changes), some parents prefer moving to training pants. They make for extra-quick changes and allow toddlers to pull them down themselves when getting used to potty. This can help boost their confidence and independence.

Is my baby’s diaper too small?

We recommend looking out for the following signs when deciding whether or not to size up:

1) Leaking
The bigger the diaper, the better its absorbency. If you notice your baby’s diaper suddenly doesn’t last as long as it used to, sizing up usually resolves the problem. Just keep in mind that if the diaper is far too large, baby’s business might escape via the gap between the skin and absorbent lining before the diaper can absorb it. Read on for some advice on how to ensure you’ve got the best fit for your little one.

2) Red marks around tummy and thighs
Even in the absence of marks, your little one might seem uncomfortable in their diaper or suddenly sweat around the waistband.

3) Poor fit
We have put together a handy fit guide for you. The next section explains exactly how big the diaper should be on your child, how it should fit and how to best fasten it.

Is my baby’s nappy too small?
Image: @the_photographer_mama

How to fit the diaper?

The diaper should be tall enough to reach just below the belly button. If it sits lower, it’s time to try the next size up. 

You should be able to fasten the diaper comfortably with the front tabs nearly touching without breaking into sweat. 

The diaper should fit snugly around the waist, but you should be able to fit two fingers under the waistband. If you notice any red marks, size up! If the fit is loose around the waist, don’t be afraid to overlap the front tabs! 

You do however want a looser fit below the waist. This will be more comfortable and prevent leaks. The buttocks should be completely covered by the width of the diaper. 

Ensure there aren’t any gaps around the legs and the material around the cuffs is untucked. This will help prevent leaks, so running a finger around each leg is always a good idea.

How do I know when the diaper needs changing?

You will soon get to know your child and read their cues. As a general rule of thumb, you can tell when a diaper needs changing by touching the front of them with your palm. If they feel bulky and spongy, it’s time to say bye-bye 😊

How do I know when the nappy needs changing?

We hope that this has answered all your questions regarding diaper fit - even those ones you didn’t know you had. If you should however have any further questions, remember that our customer service team is always here to help.

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