Is diapers size 4 profitable to sell on Amazon United States?

The niche generates $21.9M/yr across 11 tracked products. 0 of 1 products launched in the last 360 days are still selling. 90-day search growth is +1.6%. Flapen's verdict: Worth a look (53/100).

How competitive is the diapers size 4 niche?

6 brands and 58 sellers compete. The top 5 products take 80% of clicks and top 5 brands hold 98% of demand.

What do buyers complain about in diapers size 4?

Top complaints mined from reviews: Leak-Proof, Quality-Overall, Size-Overall. The return rate is 0.6%.

When does demand for diapers size 4 peak?

Demand is steady year-round — the busiest month runs 1.2× the quietest.

What does it cost to enter the diapers size 4 niche?

Listings span $17.95–$64.31; the average listing price is $37.10 (sweet spot $15–$100). The average incumbent carries 43,221 reviews — the moat a new listing must climb.

diapers size 4

Worth a look

Shows a $21.9M/yr market, but a deep review moat (43,221 avg reviews) keeps it on the watch list.

Market size

Incredible$21.9M

$21.9M/yr · 4.0M searches

Conversion

Incredible14.7%

search→purchase rate — share of searches ending in a sale

Returns

Incredible0.6%

return rate — above 5% kills the launch gate

Avg price

Incredible$37.10

avg listing price — sweet spot $15–$100

Price range

Incredible$17.95–$64.31

cheapest to priciest tracked listing — scored on the share inside $15–$100

Growth

Okay+1.6%

90-day search growth — must beat 0% to launch

Quality gap

Bad4.6★

avg incumbent rating — lower means beatable quality

Competition

Bad80%

top-5 click share — a locked-up shelf

Brand share

Bad98%

top-5 brand share — brand-locked demand

Review moat

Bad43,220.82

avg incumbent reviews — the moat a new listing must climb

According to Flapen's Amazon United States niche tracking, diapers size 4 is a $21.9M/yr Amazon United States market (4.0M searches/yr). The top 5 brands hold 98% of demand. Verdict: Worth a look — 53/100.

Data updated Jul 12, 2026 · scored weekly · How we score niches

diapers size 4 market data

Units sold / yr: 500K–600K; avg 50,000–60,000/product
Revenue / yr: $18.6M–$22.3M; units × avg price
Conversion rate: 14.7%
Avg BSR: #10
Page quality: 0%
Prime: 100%
Sponsored: 55%
Out of stock: 1.4%
Avg brand age: 61 months
Avg seller age: 137 days

Competition & brand share

The top 5 products capture 80% of clicks — a locked-up shelf that new listings rarely crack.

Brands

6 rising

Sellers

Top-5 brand share

98%

Top 20: 100%

Top-5 click share

80%

Top 20: 100%

Open market

HUGGIES53%
Pampers28%
Mama Bear13%
MooMoo Baby2%
Luvs2%
Finihen2%
Open — no brand owns it (0%)

Demand & seasonality

Weekly Amazon search volume, last 104 weeks — +1.6% search growth over the last 90 days.

No pronounced peak months · busiest ÷ quietest = 1.2×

Open Trend

Top diapers size 4 search terms

diapers size 4908K/yr -0.3%5.1% conv.
size 4 diapers725K/yr +0.3%6.3% conv.
huggies size 4622K/yr +12.3%10.9% conv.
pampers swaddlers size 4354K/yr +69.3%1.2% conv.
pampers size 4761K/yr -35.0%4.2% conv.
mama bear diapers164K/yr -31.1%1.1% conv.
diaper size 452K/yr +0.9%3.9% conv.
huggies little movers37K/yr +47.0%0.6% conv.
size 4 pampers41K/yr +6.6%3.6% conv.
baby diapers size 443K/yr -1.6%3.7% conv.

All search terms

Top diapers size 4 products on Amazon

Each bubble is one product — market share against review moat; bubble size tracks estimated sales, color grades how beatable the incumbent looks.

Beatable (≤4.3★) Contested Strong incumbent (>4.7★)

All 11 tracked products in this niche — three views at once, no toggling.

Top sellers

by 90-day click share

Huggies Size 4 Diapers Little Movers Baby Diapers Size 4 (22-37 lbs) 150 Count (6 Packs of 25) Packaging May Vary

HUGGIES$51.354.8★46,925 rev

Huggies Size 4 Diapers Little Movers Baby Diapers Size 4 (22-37 lbs) 120 Count Packaging May Vary

HUGGIES$39.334.8★46,925 rev

Amazon Brand - Mama Bear Gentle Touch Baby Diapers Formulated without Fragrance Size 4 148 Count (4 packs of 37) with Skin Protection and Leak Protection

Mama Bear$31.224.2★60,652 rev

Pampers Diapers - Baby Dry - Size 4 92 Count Absorbent Disposable Infant Diaper (Packaging May Vary)

Pampers$28.274.7★97,820 rev

Pampers Diapers - Swaddlers 360 - Size 4 132 Count up to 100% Leakproof Comfy Dry Fit Designed for Easy Changes Pull On Baby Diaper (Packaging May Vary)

Pampers$46.544.5★1,416 rev

Newest

by launch date

Finihen Toddler Boys Trainer Underwear Training Briefs MultiplePack Size 4

Finihen$17.9570 rev

4mo ago

Huggies Size 4 Diapers Little Movers Baby Diapers Size 4 (22-37 lbs) 150 Count (6 Packs of 25) Packaging May Vary

HUGGIES$51.3546,925 rev

1y ago

Pampers Diapers - Swaddlers 360 - Size 4 132 Count up to 100% Leakproof Comfy Dry Fit Designed for Easy Changes Pull On Baby Diaper (Packaging May Vary)

Pampers$46.541,416 rev

2y ago

MooMoo Baby Training Underwear for Boys and Girls Absorbent Toddler Training Pants Cotton Washable and Reusable 2T-7T 8 Packs

MooMoo Baby$31.2817,365 rev

4y ago

Huggies Little Movers Baby Diapers Size 4 (22-37 lbs) 66 Ct Packaging May Vary

HUGGIES$25.3346,925 rev

5y ago

What buyers say about diapers size 4

What buyers praise and complain about, mined from review topics.

What buyers love

Quality-Overall12%

“the quality is always consistent”

Leak-Proof12%

“Great Leak-Free Option”

Size-Overall11%

“True to size for size 3”

Value For Money10%

“Good price”

Soft Feel8%

“Super soft, great quality and absorbent”

Absorbency6%

“Good absorbency”

Comfort-Overall4%

“Baby is comfortable”

Allergies4%

“do not cause irritation”

Ease Of Use3%

“They are easy to put on and off”

Moist/Dry3%

“We love these diapers for our son, they keep him dry all night and dont leak”

What buyers complain about

Leak-Proof13%

“it leaks terrible”

Quality-Overall11%

“Poor quality”

Size-Overall7%

“Inconsistent sizing”

Allergies7%

“My 7 month grandbaby had an allergic reaction to these diapers”

Smell7%

“Bad chemical smell”

Absorbency6%

“Not absorbent”

Hard Feel4%

“not soft whatsoever”

Functionality-Overall4%

“Weve gotten size 4 Huggies many times and this box of diapers dont work as well, tear easily, and look extra wrinkly”

Thickness3%

“thin”

Material Quality3%

“These used to be the best diapers, and then after a few times of reordering this last batch were completely different, cheaper materials, about half the absorbency”

Top return reasons

Size-Overall70%

Advertised Vs Actual Product6%

Leak-Proof4%

Age Suitability4%

Value For Money3%

Absorbency2%

Smell2%

Quality-Overall2%

Functionality-Overall1%

Thigh Fit1%

Common questions

Is diapers size 4 profitable to sell on Amazon United States?: The niche generates $21.9M/yr across 11 tracked products. 0 of 1 products launched in the last 360 days are still selling. 90-day search growth is +1.6%. Flapen's verdict: Worth a look (53/100).
How competitive is the diapers size 4 niche?: 6 brands and 58 sellers compete. The top 5 products take 80% of clicks and top 5 brands hold 98% of demand.
What do buyers complain about in diapers size 4?: Top complaints mined from reviews: Leak-Proof, Quality-Overall, Size-Overall. The return rate is 0.6%.
When does demand for diapers size 4 peak?: Demand is steady year-round — the busiest month runs 1.2× the quietest.
What does it cost to enter the diapers size 4 niche?: Listings span $17.95–$64.31; the average listing price is $37.10 (sweet spot $15–$100). The average incumbent carries 43,221 reviews — the moat a new listing must climb.