As you know, babies come in all sizes and shapes, so nappies fit a bit differently on every baby. To keep things simpler, Pampers nappy sizes are based on baby weight – not things like age or gender.

Wondering which diaper size to choose for your little one? To help you make this important decision, Pampers worked with thousands of babies and their parents, taking nearly a half-million diaper-fit measurements to create just the right range of sizes for every family. We want to make it easier to find the perfect diaper for your growing baby, and our research resulted in a diaper size and weight chart to guide you in the right direction! How Diaper Sizes Work As newborns have very delicate skin (and need gentle materials and appropriate skin care), look for a diaper that's Babies come in all sizes and shapes, so diapers fit a little differently on every child. Pampers diaper sizes go by your baby’s weight—not age or gender—as weight is the most accurate way to determine the correct fit. Most of the time, your baby's weight will fall neatly within the range of a certain diaper size, producing a good fit. But in some cases, you might need to choose between two sizes, as the weight ranges can overlap.

Pampers Easy-Ups Size Chart

If the fastening tapes don't reach the center of the waistband, it's time for a bigger size; if the tapes overlap, the diaper may be too big.

After the nappy is fastened, you should be able to fit two fingers under the waistband. This means the nappy is fitted properly — not too snug, not too loose. When your baby wears the correct diaper size, good things happen! A well-fitting diaper in the right size will be more comfortable for your baby and can help prevent leaks and blowouts from occurring.First, it helps to understand how diaper sizes work. A common question among parents is how to read a diaper size chart by age; however, age isn’t the ideal factor to consider. Instead, after taking hundreds of thousands of measurements, Pampers has organized diaper size by weight to help you select the right diaper. As you’re looking at the diaper size comparison chart below, keep in mind that your little one’s weight will be the most important factor.