How Many Diapers Will I Need the First Year?

The first-year total

Most babies go through roughly 2,500 to 3,000 diapers in the first 12 months. It is a big number because newborns need changing constantly, and it eases up steadily through the year.

How it breaks down by stage

• Newborn, first weeks: about 8 to 12 diapers a day. This is the peak, and it is why newborn and size 1 boxes empty so fast.
• Around 5 to 6 months: about 6 to 8 a day as feeding and digestion settle.
• Toward the first birthday: about 6 a day.

That works out to roughly 300 diapers a month early on, easing toward 180 to 200 a month later.

Do not overbuy by size

Here is the mistake to avoid: stocking up on newborn size. Babies blow through it in two to four weeks, and many skip it fast. Most of the first year is spent in sizes 1 through 3. Buy a single small pack of newborn, then a bit more of size 1, and scale up as you see how your baby grows. A registry is the place to ask for the bigger sizes, since those get used for months.

What it costs

About 2,500 to 3,000 diapers a year runs roughly $720 to $960 on mid-priced brands, more with premium. See how much diapers cost for the full money breakdown, and remember no federal program covers routine diapers.

The short version

Expect about 2,500 to 3,000 diapers in year one, peaking at 8 to 12 a day as a newborn and easing to about 6 a day by the first birthday. Do not overbuy newborn size. Stock sizes 1 to 3, which is where most of the year is spent.

Sources

TrustedCare, Diapering Costs (2026): https://trustedcare.com/costs/diapering-costs

American Academy of Pediatrics, HealthyChildren.org: https://www.healthychildren.org/English/tips-tools/ask-the-pediatrician/Pages/Why-is-my-baby-always-getting-diaper-rashes.aspx