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When to Move to the Next Size Diapers

Your twins will go through diapers at a rate that will surprise you.

Baby in Diaper

“Didn’t we just buy a box of diapers?” you’ll ask, surprised, when you see your stock running low. (The answer is always “yes,” by the way.)

One of the challenges of diapers is knowing when to move up to the next size. Each size diaper corresponds to a weight range to help you know what size to buy for your babies. What you may not realize is that there is about a two pound overlap between sizes. So you don’t necessarily need to max out the weight range on one size before moving up to the next size.

So how do you know when the time is right? The solution is simple:

When your twins start having blowouts and leaks on a frequent basis, it is time to move up to the next diaper size.

This may seem obvious, but in practice, it is not.

Your twins will have a poop that overflows the diaper and you’ll be so busy cleaning it up that you won’t see the pattern that is emerging.

If you hear yourself saying any of these things, it may be time to change diaper sizes:

  • “Again! She had a blowout yesterday…”
  • “What? Another blowout?”
  • “Why does she keep overflowing her diaper?”
  • “I really hate cleaning out these poopy clothes!”

Once you start to see multiple blowouts and on a recurring basis, go ahead and buy the next size diapers.

What if you still have a stack of the current size?

Two solutions: use them on the other twin or give them away.

One of our girls seemed to be having the blowout problem more than her sister. So we moved up a size on one girl and not the other.

If both your twins are ready for the upgrade but you still have left over diapers, don’t worry: diapers make great gifts for other parents-to-be. Yes, even opened packages! You just don’t have to wrap those ones up. You only have to buy one package of diapers to appreciate even an opened package.

What if we move up a size and the diapers are too big?

Don’t let the “too big” possibility stop you from proceeding. Even if they don’t fit today, your twins will keep growing and they can start wearing them in the near future.

I will say, that with our four kids, we’ve never had the problem of poop leaving a “too big” diaper.

Why do diapers cost so much?

Short of changing professions or buying stock in Pampers or Huggies, you may just have to accept the fact that someone’s getting rich at your expense. Diapers are one of the financial curses of twins. Go get yourself a Costco membership and you can save on the diapers.

I talk more about diapers and caring for your twins’ potty needs in Chapter 12 of my book, the Dad’s Guide to Raising Twins: How to Thrive as a Father of Twins.

Picture by Jessica Merz

Further Reading

Don't forget to pick up a copy of the definitive guide to raising twins. "Dad's Guide to Raising Twins" was written for fathers of twins to help guide you through the first several years with twins. Click here to learn more about the book and get your copy.

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Written by , author of The Dad's Guide to Twins


  1. tanner says

    I recommend cloth diapering. Once you get past the initial purchase they pay for themselves in about 8 months. After that they save about 50 buckets a month.

    • says

      @Tanner – thanks for sharing what has worked with your family. I’ve heard from other parents of twins that used cloth diapers and were happy with that decision too.

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