How Many Diapers Do I Need For My Baby? It’s a Lot Simpler Than You Think!

Diapers are a huge part of having a baby. They can also be the most expensive part as well. I have often asked myself, how many diapers do I need to buy at a time? It can be pretty difficult to figure out, especially since each age of baby needs to be changed a different amount of occasions each day.

In this handy guide, I will explain how many diapers you should buy for different age groups, the various diaper types to consider, and offer you some tips so that you'll become a diaper buying pro!

So How Many Diapers Do I Really Need?

Whenever you are buying anything for your child, there are going to be several factors to consider. This is especially true when you are attempting to figure out your diaper budget. The biggest factor for diaper size and the amount you purchase is going to be the age of your child and their weight.


A newborn (0-1 months) will need their diaper changed a lot. They will go through about ten to fourteen diapers a day! As such, you will want to make sure that you have plenty of diapers on hand.

Diaper Size - At first, you will need to use newborn diapers. However, once your baby's umbilical cord stump falls off (around three weeks), you can transition to size one diapers.

1-5 Months

Once your child has gained some weight, and their body systems have had some time to get acclimated to life outside the womb, they will start needing fewer diaper changes. You should expect anywhere from eight to ten diaper changes a day during this period.

Diaper Size - You will most likely need size two diapers for your child at this point in their development.

5-9 Months

With yet another stage of development, you should see another reduction in the number of diapers needed per day. During this span of months, you’ll change about eight diapers per day.

Diaper Size - You will need size three diapers at this point of your baby's development.

9-12 Months

Even though your little bundle of joy is becoming a big bundle of joy, you should still expect to use about eight diapers a day during these months.

Diaper Size - Size 4 diapers are the biggest diapers you will need for your infant.

12-18 Months

Now that your baby is over one year old, you will start to see a reduction in the number of diapers needed per day. You should average about six diaper changes a day during this period.

Diaper Size - For this stretch of your child's development, you will most likely need diapers in the size 4 or 5 categories.


Purchasing diapers for a toddler can be especially tricky, since they may begin to become potty trained. Once my son turned two, he only started needing two diapers a day. One was for during his nap, and the other was for at night. However, the common need is four to six diapers a day.

Diaper Size - Since your little bundle is now a big kid, you will probably need size 5 or 6 diapers.

Tips for Getting The Most Diapers For Your Money

Now that you understand the different size requirements and average diaper changes for each age level let's go over some tips to help you make the most with your budget!

#1. Type of Diaper

There are two basic types of diapers to take into account when you are buying:

  • Daytime - Daytime diapers are cheaper than nighttime diapers, but do not have as much absorbency. It makes more sense to purchase this type of diaper when your baby is younger and will not produce as much liquid as an older child.
  • Nighttime - Nighttime diapers are ideal for older children who soak through regular diapers. They are more absorbent than daytime diapers but are more expensive. However, if you purchase the nighttime diapers, you will probably be able to make the box last longer because of their extra absorbent nature. If you would like some more information about the best overnight diapers, please read "Spend Wonderful Nights With The Best Overnight Diapers".

#2. Package Size

When purchasing diapers, there is a litany of packaging choices available. This allows you to get a close estimate of how many diapers that will need to purchase. 

For instance, for the first thirty days of your new child’s life, your baby will go through about 420 diapers (14 per day x 30 days). Using that number and a favorite brand's available packaging size, you could purchase just three large packs (128 diapers each) and one smaller pack (33 diapers each) and use all of the diapers.

If you do these simple calculations each month based on your child’s diapering needs, you will make sure that you don’t overspend on diapers.

#3. Diaper Return/Exchange

Of course, even the best calculations can’t take into account every baby’s changing diaper needs. Most stores will accept unopened diaper sleeves (they don't need to be in the box) for either a refund, store credit, or an even exchange for the next diaper size up. To take advantage of this, however, please keep the following in mind:

  • Save your receipt
  • Do not open packs ahead of time

#4. Buying Diapers on Sale to Stockpile Your Supply

This is a bit more obvious than some other tips. Make sure that you clip coupons and look out for sales on your brand of diapers. You can also sign up for a newsletter on your diaper brands website to get coupons emailed directly to you! For further information on stockpiling diapers, you can watch this helpful video.

See, Now Isn’t That So Simple?

When you first begin planning for a baby’s diapers in your budget, the task can seem overwhelming. Thankfully, all you need to do is:

  • Plan out your child’s diaper size.
  • Plan the number of diapers they will need.
  • Buy only the package sizes that you need.
  • Clip coupons
  • Buy diapers on sale.

If you can follow these guidelines, I know you'll have no trouble staying on budget. Please let me know what you thought of the article in the comments below, and if you have any other great money saving tips, please share them as well!

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Veronica Mitchell

Hi! My name is Veronica Mitchell. I am a mother to two adorable little girls and a handsome little boy. I spend my days caring from my children, packing lunches, reading aloud, kissing boo-boos, and working as the Chief Editor of My Parenting Journey. On this site, you will find friendly advice, expert suggestions, and guides to all shopping for the products you actually need.

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