Up & Up Diaper Size Guide: Target's Value Fit by Weight

Up & Up is Target's house diaper, a value pick that consistently punches above its price and earns a loyal following among Target regulars. Because the savings only land if the diaper fits, the first step is matching your baby's weight to the right size.

This guide lays out the full Up & Up range, what to expect at each size, how much to buy, and how the sizing compares to the brands you might be switching from. The finder above does the weight-to-size match instantly; the sections below fill in everything around it.

Understanding Up & Up sizes

Up & Up SuperAbsorb covers the full everyday span, Newborn through Size 7, so you can stay on Target's brand from the early weeks onward. Sizing follows the standard US weight chart shared across brands, which means your size number carries over from whatever you used before. Weight drives the size, the ranges overlap, and your baby's build breaks the tie when they sit between two.

Usefully, the overnight version, SuperAbsorb Overnight, reaches up to Size 7 as well, so older toddlers stay covered at night, though it starts at Size 3 rather than Newborn. That full-range overnight is unusual; many brands stop their overnight line at Size 6.

Up & Up size chart

Size	Weight
Newborn	up to 10 lbs
Size 1	8–14 lbs
Size 2	12–18 lbs
Size 3	16–28 lbs
Size 4	22–37 lbs
Size 5	27+ lbs
Size 6	35+ lbs
Size 7	41+ lbs

What to expect at each size

Newborn and Size 1 pass quickly, with frequent changes and fast growth, so a single pack of each is plenty. SuperAbsorb handles both, and a snug newborn fit is your best defense against early blowouts.

Size 2 and especially Size 3 are the heart of the first year. Size 3 spans a wide weight range and overlaps crawling and cruising, so it is the longest-worn size and the right one to buy in bulk. It is also where you can add SuperAbsorb Overnight, available from Size 3, for babies who soak through by morning.

From Size 4 to Size 7 the changes slow down but get heavier, and sleeps get longer. Because both the daytime and overnight Up & Up lines run all the way to Size 7, you are covered through the toddler years without switching brands, which is genuinely handy if your child potty-trains later than average.

Every Up & Up diaper, reviewed

Which Up & Up diaper fits which size

SuperAbsorb is the everyday default across the whole size range, Newborn to Size 7. From Size 3 up, SuperAbsorb Overnight adds nighttime absorbency and, unlike many overnight lines, carries on through Size 7. There is no swim option in the Up & Up range. The coverage grid above shows where each line picks up and how far it goes.

What Up & Up diapers cost

Up & Up is one of the best value-per-diaper picks anywhere, regular and overnight alike. Plug your change frequency into the estimator above to see the yearly math; it is a big part of why Target shoppers stick with it. The overnight line costs a little more each but is still far below premium overnight diapers, making it an easy upgrade for nights without blowing the budget.

How many Up & Up diapers to buy by size

Stock Up & Up by how fast each size moves. One pack covers Newborn and one covers Size 1, since babies usually leave both within weeks. Buy moderately at Size 2, then stock up at Size 3, where bulk boxes and long wear time make the value land hardest. Sizes 4 through 7 last progressively longer, so reorder as you go. Target's frequent diaper deals and store-brand pricing reward buying a box of your main size while keeping a smaller pack of the next size up in reserve for the inevitable growth spurt.

Up & Up sizing tips, from newborn to potty training

Up & Up rewards a little planning. Weigh your baby every couple of weeks in the early months and pick the size by weight; because both the daytime and overnight lines run all the way to Size 7, you can stay on Target's brand from the first weeks through potty training without ever switching. That full-range overnight line is genuinely unusual and worth remembering, since many brands abandon you at Size 6 just when an older toddler needs the most nighttime capacity.

Use the size overlap to split day from night. Run the snugger size by day for leak-free frequent changes, and the larger size, or SuperAbsorb Overnight from Size 3, at night for the long haul. Before Size 3, size up a regular SuperAbsorb for sleep if your baby wakes wet. This simple split is the most useful sizing habit there is, and Up & Up makes it easy because both lines reach so far up the range.

Time your buying to Target's rhythm. Target runs frequent diaper promotions and gift-card deals, so when your main size, usually Size 3, is on offer, buy a box and add a smaller pack of the next size up as a growth-spurt buffer. Keep early sizes lean, since Newborn and Size 1 pass in weeks, and lean on the two-finger waistband check to know when to move up: snug but not marking, with the leg cuffs turned out, is the fit that keeps a value diaper performing like a pricier one.

Getting the fit right

Up & Up is rated true to size. As with any value diaper, a snug, correct fit is what keeps performance high, so check for red marks and leg gaps and step up a size when the signs appear. The diaper should sit below the belly button with the leg cuffs turned out and cupped around the thighs. Use the quick checker above if you are on the fence about whether to size up.

Switching to or from Up & Up

Switching to Up & Up from Pampers, Huggies, or another store brand keeps your size number, thanks to the standard weight chart. The catch is simply that Up & Up is Target-exclusive, so plan to buy it at Target or on Target.com. As with any brand change, give it a few days and judge by weight and fit rather than one early leak, and remember the full-range overnight line means you will not be forced off the brand as your toddler grows.

Common Up & Up sizing mistakes to avoid

The most frequent Up & Up sizing mistake is overstocking Newborn and Size 1 because the price is low; both sizes pass in weeks, so buy them by the single pack and save bulk buying for Size 3. The second is treating leaks as proof a store brand cannot keep up. In practice, most Up & Up leaks trace to a diaper that is slightly too big, so check the leg seal and consider sizing down before you size up.

A third pitfall is forgetting just how far the range goes. Both the daytime and overnight lines run to Size 7, so there is no need to switch brands for an older toddler, yet parents sometimes do. Related to that, do not overlook SuperAbsorb Overnight for wet mornings once you reach Size 3, or size up a daytime diaper for sleep before then. A fourth mistake is expecting to grab Up & Up anywhere; it is Target-exclusive, so plan your buying around a Target trip or Target.com order, and keep a reserve pack of the next size up. Finally, skip the calendar and weigh your baby, since two babies of the same age can be a full size apart, and let the fit signs, not age, tell you when to move up.

How Up & Up compares

Here is how SuperAbsorb compares with the diapers parents most often line up against it.

The bottom line

If you already shop at Target, Up & Up is an easy, low-cost diaper that rarely disappoints and covers the entire range, day and night, all the way to Size 7. Dial in the size, keep the next one handy, and it delivers well above its price.

Comparing brands? Browse our other diaper size guides to see how the fit and sizing stack up.

Up & Up diaper size FAQ

What sizes does Up & Up come in?

Up & Up SuperAbsorb covers Newborn through Size 7. SuperAbsorb Overnight runs from Size 3 through Size 7.

Do Up & Up diapers run true to size?

Yes. They use standard US weight ranges, so go by weight and size up if you notice marks or leaks.

Is Up & Up a good value?

Yes. Both the daytime and overnight lines are among the lowest cost per diaper we track, while performing well for the money.

Does Up & Up make an overnight diaper?

Yes, SuperAbsorb Overnight, which usefully runs all the way to Size 7, so older toddlers are covered at night. It starts at Size 3.

Where do I buy Up & Up diapers?

Up & Up is Target's own brand, sold in Target stores and on Target.com.

When should I move up a size?

Size up when tabs no longer reach the center, leaks appear at the legs or back, or the waistband leaves marks. Overlapping ranges mean the next size fits right away.

Which Up & Up size lasts longest?

Size 3, as with most brands. It covers a wide weight range and the crawling-to-walking months, so it is the best size to buy in a bulk box.

Does Up & Up have a swim diaper?

No. You will need a dedicated swim diaper from another brand for pool and beach days.