Size 4 Diapers Market Report: Sales Volume, Market Share, Leading Brands & Market Trends
Size 4 Diapers sales on Amazon US totaled 217,800 units in July 2026 (▼ 8.9% vs. the prior month), generating an estimated $7,792,328 in revenue across the 50 top-ranked ASINs for this search term. Demand is heavily concentrated at the top of the ranking — the ten best performers capture 56.5% of unit volume and 55.8% of revenue, while a typical listing is priced at $38.25. The keyword itself pulled 60,519 Amazon queries over the same period (▲ 8.1% MoM).
Zooming out to the 12-month window ending July 2026, the size 4 diapers Top 50 moved 2,300,200 units and $92,168,662 in cumulative sales — an average of 191,683 units and $7,680,722 per month. Monthly throughput topped out at 239,000 units in June 2026 and dipped to 127,400 in May 2026, leaving the latest reading 12.7% higher than August 2025.
Size 4 Diapers Sales Trend (Trailing 12 Months)
Based on the top 50 ASINs by monthly sales for this keyword
2025/08
2025/09
2025/10
2025/11
2025/12
2026/01
2026/02
2026/03
2026/04
2026/05
2026/06
2026/07
Monthly Sales 2026/07
217.8K
▼ 8.9% MoM
Monthly Revenue 2026/07
$7.8M
▼ 8.3% MoM
Top 10 Market Share 2026/07
56.5%
Size 4 Diapers Market Share & Sales Concentration on Amazon US — July 2026
The most-sold size 4 diapers listing on Amazon US in July 2026 is ASIN B0795WF49L (Brand: Pampers), which sold 30,000 units at $9.97 apiece — equal to 13.8% of every unit tracked in this report and 1.5× the volume of the No. 2 listing.
The Top 10 ASINs account for 123,000 units and $4,346,610 in July 2026 — 56.5% of unit volume and 55.8% of revenue among all 50 ranked ASINs in this report.
Sales Volume of Top ASINs for 'Size 4 Diapers' on Amazon
July 2026
![Pampers Aqua Pure Baby Wipes, 99% Water, Fragrance Free, Unscented, Water Based, Multi-Use, 672 Wipes Total (12X Flip-Top Packs) [Packaging May Vary] (ASIN B0BJ13XWDD), rank #5 by monthly sales volume for 'Size 4 Diapers' on Amazon](https://m.media-amazon.com/images/I/81im2KKTr0L._AC_UY512_.jpg)
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Top 5 Volume Share breakdown
B0795WF49L
Pampers Swim Diapers - Splashers - Size 4, 18 Count, Gap-Free Disposable Baby Swimming Pants
30K
▼ 25.0%vs. prior month
$299.1K
latest month
12-month trend
B07DC8BR3B
Pampers Swaddlers Diapers, Size 4 (15-34 lbs), 150 Count, Fragrance Free, Hypoallergenic, Absorbent, Pediatrician Recommended, Skin Safe
20K
▲ 0.0%vs. prior month
$995.4K
latest month
12-month trend
B07LFQ9CXC
Pampers Swaddlers Diapers, Size 4 (15-34 lbs), 120 Count, Fragrance Free, Hypoallergenic, Absorbent, Pediatrician Recommended, Skin Safe
10K
▲ 0.0%vs. prior month
$449.8K
latest month
12-month trend
B08W9G2JCX
Pampers Diapers - Cruisers 360 - Size 4, 144 Count, Babyproof up to 100% Leakproof Pull-On Diaper
10K
▲ 0.0%vs. prior month
$497.7K
latest month
12-month trend
B0BJ13XWDD
Pampers Aqua Pure Baby Wipes, 99% Water, Fragrance Free, Unscented, Water Based, Multi-Use, 672 Wipes Total (12X Flip-Top Packs) [Packaging May Vary]
10K
▲ 0.0%vs. prior month
$339.8K
latest month
12-month trend
B0DKYRHL2Y
Huggies Little Movers Diapers Size 4, 150 Count (6 Packs of 25)
10K
▲ 0.0%vs. prior month
$528K
latest month
12-month trend
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Best Size 4 Diapers Brands on Amazon US — Top 3 Brand Sales Concentration (July 2026)
Pampers is the best-performing size 4 diapers brand in July 2026, moving 89,000 units across 6 ASINs for 72.4% of Top 10 volume. HUGGIES follows with 27,000 units (22.0%), ahead of Pull-Ups on 7,000 units (5.7%).
With 3 brands splitting the Top 10 and 100.0% of volume sitting with three of them, this is a concentrated shelf — the leaders hold multiple listings or one very high-velocity ASIN, so a new entrant competes against established review moats rather than an open field. Average selling prices among the leaders run from $29.97 to $40.66, which frames the price band a competing listing has to justify.
Brand share of Top 10 volume
Pampers
6 ASINs in Top 10
72.4%
Units
89K
Revenue
$3M
Avg. price
$39.67
B0795WF49L
$9.97·★4.7·31.5K revsPampers Swim Diapers - Splashers - Size 4, 18 Count, Gap-Free Disposable Baby Swimming Pants
Units sold30KB07DC8BR3B
$49.77·★4.8·129.6K revsPampers Swaddlers Diapers, Size 4 (15-34 lbs), 150 Count, Fragrance Free, Hypoallergenic, Absorbent, Pediatrician Recommended, Skin Safe
Units sold20KB07LFQ9CXC
$44.99·★4.8·129.6K revsPampers Swaddlers Diapers, Size 4 (15-34 lbs), 120 Count, Fragrance Free, Hypoallergenic, Absorbent, Pediatrician Recommended, Skin Safe
Units sold10KB08W9G2JCX
$49.77·★4.7·27.7K revsPampers Diapers - Cruisers 360 - Size 4, 144 Count, Babyproof up to 100% Leakproof Pull-On Diaper
Units sold10KB0BJ13XWDD
$34.23·★4.8·33.5K revsPampers Aqua Pure Baby Wipes, 99% Water, Fragrance Free, Unscented, Water Based, Multi-Use, 672 Wipes Total (12X Flip-Top Packs) [Packaging May Vary]
Units sold10KB078WBDSBF
$49.27·★4.7·46.2K revsPampers Training Pants - Easy Ups Boys & Girls Bluey - Size 4T-5T, 104 Count, Children's Potty Underwear (Packaging May Vary)
Units sold9K
HUGGIES
3 ASINs in Top 10
22.0%
Units
27K
Revenue
$1.1M
Avg. price
$40.66
B0DKYRHL2Y
$51.99·★4.8·46.8K revsHuggies Little Movers Diapers Size 4, 150 Count (6 Packs of 25)
Units sold10KB08VC33TDN
$44.99·★4.8·46.8K revsHUGGIES Size 4 Diapers, Little Movers Baby Diapers, Size 4 (22-37 lbs), 120 Count, Packaging May Vary
Units sold10KB0DFRHY91R
$24.99·★4.7·64.2K revsHUGGIES Snug & Dry Diapers Size 4, 92 Count
Units sold7K
Pull-Ups
1 ASIN in Top 10
5.7%
Units
7K
Revenue
$209.9K
Avg. price
$29.97
B0CQ8SJYQV
$29.97·★4.7·11.2K revsPull-Ups Boys' Night-Time Potty Training Pants, Size 4T-5T, 52 Count
Units sold7K
Trending Size 4 Diapers Products — Growth Leaders & New Top 10 Entrants
Based on July 2026 data, this shortlist surfaces the two kinds of ASIN worth keeping an eye on — the ones that just broke into the Top 10, and the ones growing fastest month over month. Specifically, one ASIN forced its way in: B0DFRHY91R booked 7K units at $24.99, with ▲ 16.7% MoM change. On the growth side, B0GQSDLQ55 leads positive momentum with ▲ 900.0% MoM growth on 1K units, with B07H34Q5S5 close behind at ▲ 122.2% MoM on 2K units.
The two signals carry different weight. A fresh entrant means share has already changed hands — an incumbent gave up its place to make room, so any competitive set drawn up a month ago is now out of date. A steep growth rate works as the earlier warning: it marks demand that is still compounding, usually a month or two before the ranking catches up to it.
B0DFRHY91R
HUGGIES Snug & Dry Diapers Size 4, 92 Count
Price
$24.99
Rating
4.7
Reviews
64.2K
Latest month sales
B0GQSDLQ55
Pura Baby Diapers Size 4 (22-32 lbs) 108 Count Sensitive Skin | 12 Hour Leak Protection, New Blowout Blocker, Cloud Soft, Totally Chlorine Free*, Allergy UK Certified
Price
$60.79
Rating
2.7
Reviews
258
Latest month sales
B07H34Q5S5
Pampers Diapers - Baby Dry - Size 4, 186 Count, Absorbent Disposable Infant Diaper (Packaging May Vary)
Unlock to view ASIN details and product titles
Price
$49.77
Rating
4.7
Reviews
96.7K
Latest month sales
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