Diaper Size Guide

Diaper Size Guide

Diaper sizes are determined by how much liquid they hold, which is why you will see varying sizes across parameters across brands and why your baby may not necessarily be the same size from one brand to another. Because of this, and because ours are sized for maximum absorption, we’ve put together a simple guide to help you determine the right size of Eco Pea diapers to choose for your baby. 

How to choose the right size. To find the right size diaper for your child, check the size guide that tells you what size diaper your child will be depending on their weight (ours is below), and then consider the other factors listed below should your child be on the cusp of any size.

How a diaper should fit. Ideally, your child’s diaper will come up to just below their belly button, you’re able to fasten it without having to tug on the straps, it doesn’t make marks on baby’s thighs, and it doesn’t easily leak. Another sign that a diaper is the proper size is if you can fit about two fingers into the waist of the diaper when it’s fastened.

When to size up. If you notice that they’re having frequent leaks or blowouts, the top of their bottom is easily exposed, they have red marks around their thighs, or you’re having trouble fastening the straps, it’s probably time to go up a size. 

When to size down. If there seems to be a lot of space between your child’s diaper and their legs, it covers way above  their belly button, the straps overlap when fastened, or the diaper seems to be leaking more than expected, it’s probably best to move one size down. The nice thing about diapers that are too big is that you don’t have to donate or throw them out, as baby will eventually grow into them.   

Why our sizes look different. Eco Pea diaper sizing looks a bit different than other diaper brands because our diapers have been designed to absorb the most liquid, and therefore can fit on the larger side. This means that our diapers don’t only work great during the day, but overnight as well.

How to figure out your child’s weight. Because your child can gain a considerable amount of weight between paediatrician visits, it might be difficult to know their exact weight when trying to determine their diaper size. A trick is to get on the scale and note your own weight, then get back on the scale with your baby. The difference in the two numbers is your baby’s approximate weight. For example, if you get on the scale and you’re 140lbs, and you’re 155lbs when holding your child, then they’re about 15lbs. 

As you try to find the right diaper size, we hope this guide adds ease to a process that can sometimes feel confounding. When you find the sweet spot with diaper size, your parent’s intuition will likely get a ping. Suddenly, it will be simpler to get the diapers on, you’ll no longer be dealing with regular leaks, and above all, your child will express little to no complaints about wearing diapers.


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