Baby Diaper Size Guide: How to Find the Right Diaper Size for Baby?

Preparing diapers really matters before the baby is due. If you are still hesitant about how to find the right diaper size, read this baby diaper size guide!!!

Preparing diapers really matters before the baby is due. And understanding diaper size is one of the top priorities. If you find yourself still strolling with how to find the right diaper size for baby and wondering which size fits for baby, here you don’t need to grapple with this topic as we are here to tell what you need in every aspect. Read on this baby diaper size guide for more diaper details!

Why Is It Important to Buy Diapers of the Right Size?

The Baby’s weight is the main factor in judging the correct-sized diaper. If the diaper size is incorrect, in addition to making the baby uncomfortable, it is also prone to leakage of urine or stool, and other accidents! And choosing the size of disposable diapers that fit your baby can let your baby play and rest, stress-free.

Baby Diaper Size Chart for Disposable Diapers

Many parents hesitate before selecting diaper sizes. Buying the proper diaper size is a task not to be taken lightly, not least because it concerns the healthy and happy growth of the baby. Here’s a general overview of the baby diaper size chart by age and weight.

Diaper Size Weight AgeAverage Number of Diapers Per Day
NewbornUp to 10 lbsThe first 2 or 3 weeks6-9
Size 18-14 lbsBirth – 4 months6-9
Size 212-18 lbs3 – 8 months6-9
Size 316-28 lbs5 – 24 months5-7
Size 422-37 lbs18-36 months5-7
Size 527 lbs+3 years +5-7
Size 635 lbs+4 years +5-7

Note: The chart shows a general overview of diaper size by age and weight. Different brands may lightly differ in different sizing.

How to Know If You Have Chosen the Right Diaper Size?

It is very common for babies to urinate or poop to have side leakage, but if it happens frequently, it is likely that the size of the baby’s diaper is not suitable for your baby. Size concerns or wrong fit baby diapers are just one of the primary factors for diaper incidents in the first years and consequently, as moms and dads, you need to exercise care while choosing the appropriate size.

The following are some signs to help you analyze whether the size of the diaper has reached the ideal size:

  • Frequent leakage of excrement

If your baby frequently experiences diaper leaks, it’s time to accept the tips! The reason for this may be that the diaper may be small in size and cannot properly hold your child’s excrement. If such accidents happen more frequently, you should understand that you have chosen the wrong dimension.

  • Marks on the child’s skin.

Have you noticed any type of red marks around your infant’s midsection or his thighs? It’s because of putting on a tight-fitting diaper if of course. The baby diaper flexible is supposed to stand by against your baby’s skin to avoid any kind of leakages yet it must not be so tight that it makes marks on your baby’s delicate skin. If you find such red marks, it suggests that you spent your money in buying the incorrect diaper size. It’s time to up the size.

  • Hard to tape.

If you are experiencing any kind of trouble in taping the baby diaper, it’s a clear indicator that you’re utilizing the incorrect size for your infant! Vigorously shutting the baby diaper tape not just boosts the chances of diaper leaks and also problems however it may additionally make the child utterly uneasy.

  • Read the size on the box

Your baby’s weight is a key parameter in determining the size of the diaper, but even so, sometimes you may need to keep your baby’s requirements in mind. If your baby has more stools at a certain stage (such as teething or crawling), you may need to buy a larger size based on the baby’s needs, rather than blindly buying according to the weight and size discussed on the diaper packaging.

When to Up a Diaper Size?

As the baby grows, the size of diapers changes accordingly. When the following signal appears, it means that the size of the baby’s diaper should be changed.

The first struggle that newbie parents experience with diapers is learning the change them and the next struggle in line can be knowing exactly when it is time to go up the size! Babies grow rapidly in the first year after birth and so does their diaper sizes. Well, there is no need to feel overwhelmed as we have shortlisted some important pointers that can help you get a fair idea to know about the right time to up the diaper size for your baby:

  • If the fastening tape does not reach the center of the waistband, a bigger size is needed; if the tape overlaps, the diaper may be too large.
  • It’s time to pick a bigger size if you can not fit your 2 fingers pleasantly under the belt that secures the diaper.
  • If you notice red marks on your child’s stubborn belly or upper legs when you eliminate the diaper, you may require to boost the size.
  • If the diaper does not totally cover your child’s butts, select a bigger size.
  • If your child usually has diaper breakout, it may be due to the fact that her diaper is too small to
  • maintain her skin hydrated.
  • If your infant reveals indications of pain (for example, pulling on the baby diaper), the baby diaper may be as well small.

Other Diaper Tips:

Start in small batches

If you have been looking for a suitable overnight baby diaper size, then you need to try a brand and a diaper size first. However, it is slightly inappropriate to stock up baby diapers just through the rough diaper size chart. After all, this size chart is just a reference, and we have to judge it according to the actual situation of the baby’s use. Instead, you should test in small batches before buying all the baby diapers you may need.

Check the Fit

After you have selected the size, please check the fitting method of the baby diaper to prevent leakage. If you wear it irregularly, you must make adjustments in time. Every time you change, make sure to cover all the ideal areas such as the back and buttocks. If these areas are not covered, it may cause excrement leakage or discomfort for the baby. Check for fit and symmetry. Note that the belt is just at the waist, not too high in the front, not too low in the back, and vice versa. A diaper with a resealable label will allow you to make any type of adjustment for a comfortable, flexible fit.

Check the cuff

Noted that the cuffs of disposable diapers around the leg openings are facing outward, not tucked in. Tucked into the cuffs can cause leakage in the leg.

Consider using a diaper pad

Most diaper brands don’t start offering overnight diapers until size 3. If they sleep for a long time and are not ready to pee before they wake up, we suggest you buy overnight diaper pad to put in your baby’s diaper before using Size 3. 

This way you don’t have to choose between waking up a sleeping baby to change a diaper or washing piles of wet pajamas and bedding!


The right diaper size allows the baby to twist, crawl and walk contented freely.

Knowing the diaper size can help you avoid minefields before buying. This baby diaper size guide can help you determine the diaper size for your baby and understand related diaper issues. Of course, it is also important to check each diaper brand, because different brands of diapers will still be slightly different.

If you are not satisfied with the current diapers, just change the brand. The market is flooded with environmentally friendly and skin-friendly diapers of various shapes and sizes. It is not difficult to find the perfect fit for your baby.