The Honest Company Diaper Size Guide: Sizing by Weight

The Honest Company pairs plant-based materials with the largest, most-loved print library in the category, which is much of its appeal. The designs only look good when the diaper fits, so the starting point is matching your baby's weight to the right Honest size.

This guide covers the full Honest range, what to expect at each size, how much to buy, and how the sizing compares to other brands. Use the finder above to match your baby's weight, then read on for the rest.

Understanding The Honest Company sizes

The everyday Honest Diapers line spans Newborn through Size 7, a genuinely full range using the standard US weight chart, so sizes match other brands and you go by weight rather than age. The Overnight line is narrower, covering Size 3 through Size 6 for longer sleeps.

The ranges overlap, so a baby can wear two sizes during a growth phase; let the leg fit decide. The everyday line reaching all the way to Size 7 is a real plus for larger toddlers, since you can stay on the brand through potty training. There is no Honest swim diaper, so the pool needs a dedicated swim diaper from elsewhere.

The Honest Company size chart

What to expect at each size

Through Newborn and Size 1, changes are frequent and growth is quick, so keep your supply modest. The Honest Diapers line covers both with plant-based materials and the brand's signature prints, which is part of the fun at this stage.

Size 2 and Size 3 carry most of the first year, with Size 3 the long-running size. From Size 3 you can add the Overnight line for babies who soak through by morning, while the everyday diaper continues by day.

From Size 4 to Size 7, changes slow and get heavier and sleeps lengthen. Because the everyday line runs all the way to Size 7, you stay on Honest through the toddler years without switching, which is genuinely useful for a later potty-trainer. The Overnight line stops at Size 6, so the very largest sizes are daytime-only.

Every The Honest Company diaper, reviewed

Honest Diapers

Daytime

4.5$0.60/diaper

Comfortable diaper with leak protection and sustainable materials. Cute designs and diaper duty wetness indicator.

Read the Honest Diapers review

Overnight Diapers

Overnight

4.3$0.68/diaper

Soft overnight diapers for dry, comfy nights with advanced leak protection.

Read the Overnight Diapers review

Which The Honest Company diaper fits which size

Honest Diapers is the everyday default across the whole Newborn-to-Size-7 range. From Size 3 up, the Overnight line adds absorbency for nights, topping out at Size 6. There is no Honest swim diaper. The grid above maps each line's coverage and shows the full daytime range.

What The Honest Company diapers cost

Honest sits in the mid-to-upper price tier, above value brands but not at the very top, reflecting the plant-based build and the design focus. The estimator above shows your everyday spend so you can weigh the premium. The Overnight line costs more per diaper, so many parents reserve it for nights and run the everyday diaper by day.

How many The Honest Company diapers to buy by size

Stock the everyday line by wear time: one pack each of Newborn and Size 1, a little more at Size 2, and a bulk buy at Size 3, the longest-worn size. The Overnight line is used only at night, so buy it in smaller quantities from Size 3 up. Honest is sold in stores, online, and by subscription with rotating prints, so set a subscription to your main everyday size, add overnight as needed, and keep the next size up on hand for growth spurts.

The Honest Company sizing tips, from newborn to potty training

The Honest Company's full everyday range makes sizing low-stress, so the main habits are about timing and the overnight split. Weigh your baby every couple of weeks in the early months and size the Honest Diapers line by weight; because it runs all the way to Size 7, you can stay on the brand from the first weeks through potty training without switching, which is genuinely handy for a later potty-trainer.

Use the size overlap and the Overnight line to handle nights. From Size 3 you can run the everyday Honest diaper by day and the Overnight diaper at night for extra capacity; before Size 3, size up a regular Honest diaper for sleep if mornings are wet. The Overnight line stops at Size 6, so once you are into the largest sizes, the day-and-night job falls back to the everyday line, sized up for sleep if needed.

Lean into the brand's print system when you buy. Honest sells in stores, online, and by subscription with rotating designs, so set a subscription to your main everyday size, usually Size 3, and add the Overnight line as a separate, smaller order for nights. Keep Newborn and Size 1 purchases small since they pass quickly, bulk-buy at Size 3, and always keep the next size up on hand. There is no Honest swim diaper, so plan a dedicated swim option for pool days, and use the two-finger waistband test plus a clean leg seal to judge the fit.

Getting the fit right

Honest runs true to size with a comfortable, flexible fit. Because the everyday line covers the full range, most families can stay on one diaper and simply track weight, sizing up at the usual signs of tabs reaching the center, a clean leg seal, and no marks. The checker above makes the call easy when you are between sizes.

Switching to or from The Honest Company

Switching to The Honest Company keeps your size number, since it uses the standard weight chart, and the everyday diaper is a comfortable plant-based build. The advantage is range: the everyday line goes all the way to Size 7, so you will not be forced off the brand as your toddler grows. There is no swim diaper, so plan a dedicated swim option for pool days, and judge the fit by weight and the usual signs over the first few days.

Common The Honest Company sizing mistakes to avoid

With The Honest Company, a common mistake is buying for the prints rather than the fit. The designs are a big part of the appeal, but a cute pattern in the wrong size still leaks, so choose by weight first and enjoy the prints second. A second mistake is overstocking the small sizes; Newborn and Size 1 go quickly, so keep them lean and bulk-buy at Size 3, the longest-worn size.

A third pitfall is forgetting there is no Honest swim diaper, then scrambling at the start of pool season; plan a dedicated swim diaper from another brand ahead of time. A fourth is overlooking that the everyday line runs all the way to Size 7, so there is no need to switch brands for an older toddler, while the Overnight line stops at Size 6, meaning the largest sizes are daytime-only and a wet morning at Size 7 calls for sizing up the everyday diaper for sleep. As a mid-to-upper-tier diaper, do not over-order a soon-to-be-outgrown size, and as always, go by weight rather than age, moving up when tabs no longer reach the center, the leg seal fails, or marks appear.

How The Honest Company compares

Here is how the everyday Honest diaper compares with the alternatives parents most often shortlist.

The bottom line

The Honest Company is the pick for parents who want plant-based materials and standout prints with a full everyday size range from Newborn to Size 7. Match the size, keep the next one ready, and the designs do the rest.

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