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Here's a size guide to estimate how many diapers you'll need—but remember to take it with a grain of salt, since every baby is different. Also note that as diaper sizes increase, you'll generally get fewer diapers per box. For example, you can expect to get 164 diapers in a size 1 box, but only 136 diapers in a size 3 box. 

Premie (6 pounds and under): Generally, only babies born prematurely need this diaper size. There's no way to predict whether your baby will be born early—and what size they will be—so plan to purchase these diapers as needed.

Newborn (10 pounds and under): Young babies grow fast, so they'll graduate from newborn diapers after a few weeks. Plan to go through about eight-12 diapers per day, which equates to about one or two boxes (assuming each box contains 140 diapers). Note that many parents receive newborn diapers from the hospital too.

Size 1 (8 -14 pounds): Most babies need size 1 diapers until 4 months of age, and they'll soil about 8-10 diapers each day. Therefore parents can plan to buy around three to four boxes, based on 164 diapers per box.

Size 2 (12-18 pounds): These are commonly used by babies 3 to 8 months old, who produce eight or nine dirty diapers each day. Expect to buy anywhere from three to five boxes, with 142 diapers in each one.

Size 3 (16-28 pounds): Now's the time when stockpiling starts to come in handy. A wide range of babies need size 3 diapers—in fact, they're commonly used by infants from 5 months to 24 months old. At this age, babies go through six or seven diapers each day, so you'll need about seven or eight boxes, assuming there's 136 diapers per box.

Size 4 (22-37 pounds): Size 4 diapers usually cater to babies between 18 months and 36 months, who soil about five to seven diapers each day. Because many babies don't need size 4 diapers until they're almost 2, many parents choose not to stock up in the early days. Expect to use anywhere from two to five boxes of these.

Size 5 (27-35 pounds): Size 5 diapers fit toddlers 27 pounds and over; kids generally reach this weight around 3 years old. Plan to buy and use these diapers as needed.

Size 6 (35 pounds and over): As the biggest size many brands make, size 6 diapers are usually reserved for those older than 4. Plan to buy and use these diapers as needed.

Size 7 (41 pounds and over): Some brands, such as Pampers, also make size 7 diapers for older toddlers. Once your child reaches 41 pounds, gauge the situation and buy these diapers accordingly. 

Here are some important things to keep in mind when estimating how many diapers you'll need:

• Most parents have a preferred diaper brand, and figuring it out takes some trial and error. You might want to hold off on stockpiling until you test a few different options.
• Some diapers brands run smaller than others. If you're worried about fit, read product reviews or ask other parents about their experience.
• Some baby weights overlap between different diaper sizes. If you don't know which size to buy, consider your little one's body structure. A chubbier baby may need the bigger option, while a longer, skinnier baby might fit best in the smaller one. Also note that smaller sizes are generally cheaper.

 Medicaid can pay for diapers for your child The medical term for diapers is incontinence supplies. This includes briefs (diapers that open on each side) and pull-up or pull-on type diapers. Incontinence supplies also include disposable underpads, liners, disposable gloves and other related items.  Coverage starts at Age 4: Wisconsin Medicaid will only pay for diapers and other related supplies for children ages 4 and older. It’s typical for children under 4 to be potty trained so Medicaid won’t cover the cost of diapers for children ages birth through 3.