Diaper Sizes by Age Guide: Diaper Size and Weight Chart

Did you know that most diapers are sized by weight and not age? One thing everyone realizes when they become parents is how much babies poop and pee. Diapers are essential, and the right fit is crucial to avoid stained clothes.

Fitting diapers isn’t like buying a T-shirt — you can’t try them on in the store. And let’s not kid ourselves — they’re pricey. Just remember, the most expensive brands aren’t necessarily the best.

---

Diaper Sizes By Age

The table below can help you find the right fit for your baby in case you don’t have a preferred brand yet. However, use it only as a general overview.

Diaper Size	Age	Weight
N	Newborn to the first weeks	Up to 10 pounds
1	Two to four months	8 to 14 pounds
2	Four to seven months	12 to 18 pounds
3	Seven to 12 months	16 to 28 pounds
4	18 to 48 months	22 to 37 pounds
5	3 years and up	27 pounds and up
6	4 years and up	35 pounds and up

Disposable Diaper Sizes

Disposable diapers are one of the most popular choices among new parents. They offer the convenience of less cleaning and quick changing.

Here are size guides to some of the top brands.

Pampers Swaddlers Size Chart

Pampers Swaddlers come with various features suitable for different ages — they’re even available in a preemie size. The newborn diapers offer an umbilical cord notch, and larger sizes have wetness indicators.

Weight	Size
Up to 6 pounds	Preemie
Up to 10 pounds	Newborn
8 to 14 pounds	Size 1
12 to 18 pounds	Size 2
16 to 28 pounds	Size 3
22 to 37 pounds	Size 4
27 pounds and up	Size 5
35 pounds and up	Size 6

Huggies Little Movers Size Chart

Huggies Little Movers feature a SnugFit waistband, leak lock system, contoured shape, double grip strips, and a dry-touch liner. They also include a SizeUp indicator, so you can easily see when it’s time to change sizes.

Weight	Size
16 to 28 pounds	Size 3
22 to 37 pounds	Size 4
27 and up	Size 5
35 and up	Size 6

Mama Bear Size Chart

Mama Bear is an Amazon-owned brand. The diapers provide optimal leakage protection and added comfort with their hypoallergenic, soft, breathable materials. They’re an excellent fit for both day and night and include a wetness indicator to show you when it’s time to change.

Weight	Size
Up to 10 pounds	Newborn
8 to 14 pounds	Size 1
12 to 18 pounds	Size 2
16 to 28 pounds	Size 3
22 to 37 pounds	Size 4
27 pounds and up	Size 5
35 pounds and up	Size 6

Pampers Pure Size Chart

Pampers Pure diapers are free of all chemicals, including bleach, fragrances, and parabens. The hypoallergenic, cotton-enhanced materials are soft and highly absorbent. They also contain Pampers leak protection and a wetness indicator, keeping your little one snug and dry.

Weight	Size
Up to 10 pounds	Newborn
8 to 14 pounds	Size 1
12 to 18 pounds	Size 2
16 to 28 pounds	Size 3
22 to 37 pounds	Size 4
27 pounds and up	Size 5
35 pounds and up	Size 6

Luvs Ultra Leakguards Size Chart

Luvs Ultra Leakguards, with their Nightlock super absorbency, are more than ample as an overnight diaper. They feature triple leak guards and soft material to keep your little one comfy. The tabs are large, so fastening is secure.

The diapers come with a wetness indicator, stretchy sides, and cute designs.

Weight	Size
Up to 10 pounds	Newborn
8 to 14 pounds	Size 1
12 to 18 pounds	Size 2
16 to 28 pounds	Size 3
22 to 37 pounds	Size 4
27 pounds and up	Size 5
35 pounds and up	Size 6

Huggies Snug & Dry Size Chart

From wet to dry in ten seconds, Huggies Snug & Dry diapers feature a leak lock system and a quilted liner. The diapers include four layers of absorbing and protecting material to ensure your baby is as comfy as they can get.

The diapers are free of bleach, scents, and lotions, which can cause issues with your baby’s skin.

Weight	Size
Up to 10 pounds	Newborn
8 to 14 pounds	Size 1
12 to 18 pounds	Size 2
16 to 28 pounds	Size 3
22 to 37 pounds	Size 4
27 pounds and up	Size 5
35 pounds and up	Size 6

Honest Diapers Size Chart

The Honest Company diapers are almost too cute to dispose of. They come in various stylish patterns and colors. They’re super soft and have high absorbency. The diapers can hold 17 times their weight in fluid, which is locked in to ensure optimal leak protection.

Weight	Size
8 to 14 pounds	Size 1
12 to 18 pounds	Size 2
16 to 28 pounds	Size 3
22 to 37 pounds	Size 4
27 pounds and up	Size 5
35 pounds and up	Size 6

Bambo Nature Size Chart

Bambo Nature diapers feature hypoallergenic materials that are highly absorbent. It’s a three-layer design with a breathable outer sheet, reducing the risk of rashes and other skin irritations.

Weight	Size
4 to 8 pounds	Newborn 1
6 to 13 pounds	Mini 2
11 to 19 pounds	Midi 3
15 to 39 pounds	Maxi 4
26 to 48 pounds	Junior 5
35 to 66 pounds	XL 6

Pampers Cruisers Size Chart

Pampers Cruisers are for active babies — they feature a stay-put waist with integrated ultra-strong grips. This makes them much stretchier than any other Pampers diaper. They are highly absorbent — providing up to 12 hours of protection.

Weight	Size
16 to 28 pounds	Size 3
22 to 37 pounds	Size 4
27 pounds and up	Size 5
35 pounds and up	Size 6
41 pounds and up	Size 7

Huggies Little Snugglers Size Chart

Huggies Little Snugglers are specially formulated to suit sensitive skin — they’re breathable and free of irritants such as scents and parabens. They are soft and come with an additional layer to absorb fluids. The newborn and preemie sizes have an umbilical cord cutout to allow your baby to heal.

Weight	Size
1 to 5 pounds	Preemie
6 to 9 pounds	Newborn
8 to 14 pounds	Size 1
12 to 18 pounds	Size 2
16 to 28 pounds	Size 3
22 to 37 pounds	Size 4
27 pounds and up	Size 5
35 pounds and up	Size 6

Overnight Diaper Sizes

Babies don’t hold back, even during the night. At nighttime, extra absorbency is a requirement we can’t ignore, and many times, standard diapers just don’t cut it.

Below, we’ve also included size guides for bedtime underwear if your child often has accidents.

Huggies Overnites Size Chart

Huggies Overnites help reduce nighttime changes with their double leak guard, providing up to 12 hours of absorbency. They have a SnugFit waistband to prevent leakage and double grip strips for a snug, protected fit. To lock in the wetness, there are embossed inner liners and a breathable outer cover.

Weight	Size
16 to 28 pounds	Size 3
22 to 37 pounds	Size 4
27 pounds and up	Size 5
35 pounds and up	Size 6

GoodNites Bedtime Underwear Size Chart

Bedwetting can lead to great frustrations both for parents and kids. GoodNites Bedtime Underwear provides a great fit with three different sizes. The underwear sports kid-friendly designs, and they are highly fluid-absorbent and odor-absorbent too.

Weight	Size
28 to 45 pounds	XS
38 to 65 pounds	S to M
60 to 120 pounds	L to XL

Honest Overnights Size Chart

Honest Overnights come with advanced nighttime protection, providing 20% more absorption than other Honest diapers. The materials are soft and hypoallergenic, and the ultra-thin diapers add to the comfort.

They also sport a cute sleepy sheep design your child may love.

Weight	Size
16 to 28 pounds	Size 3
22 to 37 pounds	Size 4
27 pounds and up	Size 5
35 pounds and up	Size 6

Pampers Ninjamas Size Chart

Pampers Ninjamas nighttime bedwetting underwear features a LockAway channel that absorbs a ton of moisture — the equivalent of three water bottles full — keeping your child and the bedsheets dry. They also have odor-masking properties, so your child and their room will still smell fresh, even after leaks. They’re soft and provide a secure fit while still feeling like underwear. Designs are available for boys and girls.

Weight	Size
38 to 70 pounds	S to M
64 to 95+ pounds	L to XL

Seventh Generation Baby Free & Clear Overnight Size Guide

Seventh Generation Overnight diapers are some of its most absorbent products, capable of protecting your little one all night. The diapers are fluffy and have a high-capacity core made from FSC-certified sustainable materials.

They have an adorable Sylvia the Sheep design with rich colors, so you can clearly distinguish your overnight diapers from daytime diapers.

Weight	Size
22 to 32 pounds	Size 4
27 to 35 pounds	Size 5
35 pounds and up	Size 6

Swim Diaper Sizes

While having fun in the sun, it’s essential to keep your little one’s solids contained. However, please remember that swim diapers aren’t made to absorb fluids — your baby will pee right through them. So remember to only use this type of diaper in the water.

Here are some different brands and sizes.

Alvababy Swim Diapers Size Chart

These reusable swim diapers from AlvaBaby are designed to hold your baby’s solids. However, they don’t have high absorbency to hold urine since they would then absorb water, making them too heavy to wear in the pool. The diapers are adorable, sporting cute ocean-inspired prints.

Weight	Size
10 to 40 pounds	S
18 to 55 pounds	L

Huggies Little Swimmers Size Chart

Huggies Little Swimmers provide exceptional protection while allowing your little one to enjoy some fun in the water. Huggies usess a non-absorbent material that won’t swell when submerged, so your baby can stay active. The diapers have reclosable side tabs, making them easy to adjust as needed.

Weight	Size
16 to 26 pounds	Size 3
24 to 34 pounds	Size 4
32 pounds and up	Size 5 to 6

Pampers Splashers Swim Diapers Size Chart

Pampers Splashers swim diapers feature a pull-on/tear-off design, making changing easier while wet. They’re fitted with a 360-degree elastic waistband to keep the diaper secure on your little one. They come with an all-over graphic to give the effect of real swimwear.

Weight	Size
13 to 24 pounds	S
20 to 33 pounds	M
31 to 40 pounds	L

Langsprit Swim Diaper Size Chart

Langsprit swim diapers offer a waterproof outer layer made of polyurethane laminate (PUL) fabric, which will contain solids passed during swimming. The diapers include precise stitching and quality fabrics to ensure your little one is comfortable. The material is durable as well — capable of withstanding play, accidents, and multiple washings.

Weight	Size
10 to 19 pounds	Size S
20 to 40 pounds	Size L

Cloth Diaper Sizes

Cloth diapers are the forerunners to disposables. And they’ve made a comeback — proving to be economical and good for your baby.

Many cloth diapers are one-size-fits-all and come with adjustable snaps.

Here are some brands and their sizes:

Kanga Care Lil Joey Size Chart

Kanga Care Lil Joey is an all-in-one cloth diaper, meaning you get the shell and inserts. It features inner gusset leak protection and elastic around the legs to prevent any runaways. The diaper is suitable for newborns and has a small cutout for the umbilical cord.

Weight	Size
4 to 12 pounds	Size newborn

Rumparooz by Kanga Care Cloth Diaper Cover Size Chart

This is a cloth diaper cover, meaning you must pair it with a fitted cloth diaper or prefold. It’s made from waterproof fabric, keeping all the fluids inside, and features elastic around the leg openings. You can use the cover multiple times before it needs a wash — unless any solid stains appear.

Weight	Size
4 to 15 pounds	Preemie/newborn
6 to 35 pounds and up	One size

OsoCozy Prefolds Size Chart

The OsoCozy Prefolds are made of 100% unbleached Indian cotton, assembled in a thick, lint-free gauze for optimal softness. These prefolds give you eight layers once folded, providing high absorbency. Remember to wash them two to three times before the first use to ensure softness and full absorption.

Weight	Size
7 to 15 pounds	Infant size 1
15 to 30 pounds	Infant size 2

Rumparooz by Kanga Care Pocket Diaper Size Chart

Rumparooz is a pocket cloth diapering system consisting of a shell and a set of highly absorbent pads or soakers. Rumparooz diapers are adorable and available in several prints for each style.

Weight	Size
6 to 40 pounds and up	One size

GroVia Reusable Hybrid Size Chart

The GroVia Reusable Hybrid is a cloth diaper shell you can pair with GroVia’s snap-in soakers or prefolds. Thanks to the easy snap-in pad system, the GroVia Hybrid can be used by other caregivers, such as grandparents or daycare staff. The waterproof shell comes with adjustable snaps to accommodate your baby’s ever-changing size.

Weight	Size
8 to 30 pounds	One size

Alvababy Baby Cloth Diapers Size Chart

Alvababy cloth diapers come in pairs of six, each with a polyester shell made with breathable and waterproof TPU. They feature a soft suede cloth inner that’s highly absorbent, drawing all the moisture away from your baby’s bottom. With each diaper, Alvababy provides you with two three-layer microfiber inserts.

Weight	Size
6.6 to 33 pounds	One size

Pull-On Diaper Sizes

Pull-on diapers are a great choice when potty training. They work like diapers, but your child can pull them up and down, similar to underwear. They give your baby a sense of independence and are a confidence booster.

Here are five brands and their size charts.

Eco by Naty Size Chart

Eco by Naty pull-up pants are 40% to 60% bio-based, consisting of recycled raw materials from Austria. The pull-up diapers have earned a Certified Vegan Logo for containing no animal products and are 100% cruelty-free. The diapers feature tear-away sides and are easy for your child to pull on.

Weight	Size
18 to 33 pounds	Size 4
26 to 40 pounds	Size 5
35 pounds and up	Size 6

Huggies Little Movers Size Chart

Huggies Little Movers diaper pants are easy to get in and out of, whether your baby stands or lies down. They have a slim, trim fit with 360-degree stretchy material, keeping the diaper on even during rigorous movement. They have a high absorbency level — protecting your little one for up to 12 hours.

Weight	Size
16 to 28 pounds	Size 3
22 to 37 pounds	Size 4
27 pounds and up	Size 5
35 pounds and up	Size 6

Bambo Nature Training Pants Size Chart

These training pants feature a highly absorbent core and a perfect-fit elastic waist that provides comfort. They are made with breathable cotton that’s soft and flexible to accommodate a moving child. All materials are dermatologically tested to ensure nothing will cause skin irritations or allergic reactions.

Weight	Size
15 to 31 pounds	Size 4
27 to 40 pounds	Size 5
40 pounds and up	Size 6

Huggies Pull-Ups Training Pants Size Chart

The Huggies pull-up training pants are adorable to look at — decked out in Mickey and Minnie Mouse themes. They’re highly absorbent and include easy-to-open sides for quick changes. To help your child learn, the graphics fade when moisture fills the diaper.

Weight	Size
16 to 34 pounds	2T to 3T
32 to 40 pounds	3T to 4T
38 to 50 pounds	4T to 5T
46 pounds and up	5T to 6T

Pampers Easy Ups Size Chart

Pampers Easy Ups training pants feature a 360-degree stretchy waistband to accommodate your on-the-go toddler.

The pull-up fits like standard underwear but offers diaper-like absorbency. The pants provide ample protection and can easily handle a wet night.

Weight	Size
16 to 34 pounds	2T to 3T
30 to 40 pounds	3T to 4T
37 pounds and up	4T to 5T

Tips for Sizing Diapers

One thing I learned as a first-time mom was that giant blowouts aren’t supposed to happen. After multiple attempts at tightening the diaper and using fitted shorts, I was finally told the diapers I was using were the wrong size. Here are five tips that helped me:

• Read the box: This is obvious, but it’s still essential to do since babies vary in shape. Two babies of similar weight won’t necessarily suit the same diaper. Manufacturers base diaper sizes on average-sized babies. I had my little one in a larger size way before he reached the previous diaper’s weight limit.
• Regular blowouts and leaks: If you often experience leaks and blowouts, it’s a clear indicator that the diaper is too small. It’s unable to contain your baby’s waste and may betoo short at the back, providing little coverage for the bottom.
• Difficult to close: Having to stretch the closures excessively is another sign the diaper is too small. This also isn’t comfortable for your little one. Let that chubby tummy breathe.
• Red marks: Red marks are never a good sign anywhere on your baby. Inspect your baby’s thighs where the elastic sits. If there’s any redness, move up a size. Leg openings are supposed to sit tight but should never create marks.
• Test drive: We highly recommend you buy a small supply of different sizes from various brands if you’re a first-time parent. This way, you test drive which size is best suited to your little one without wasting a ton of diapers or cash.

FAQs

---