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swim diapers size 4

Skip it52/100

strong incumbent ratings (4.6★) — swim diapers size 4 doesn't clear our bar today.

Market/yr

$1.5M

Growth (1y)

+79.8%

Products

23

Brands

9

was 7 a year ago

Sellers

11

Price range

$6.40–$20.40

Returns

2.4%

Rating

4.6★

52/100

Skip it

Scored 52/100 across market size, growth, competition, quality gap, and returns.

Market sizeGrowthCompetitionQuality gapReturns
Market size
42
×0.30
Growth
59
×0.30
Competition
54
×0.20
Quality gap
30
×0.10
Returns
81
×0.10

Demand

Weekly Amazon search volume, last 104 weeks — +79.8% year over year.
21K10KBlack Friday '24Spike '25Spike '26Jul '24Nov '24Mar '25Jul '25Nov '25Mar '26

Seasonality

Monthly demand index across the year — 1.00 is average.

Peak months: May, Jun, Jul · busiest ÷ quietest = 8.6×

Competition

50%MooMoo Baby
  • MooMoo Baby50%
  • Hello Bello19%
  • EZ Moms8%
  • MomEasier7%
  • ALVA7%
  • babygoal3%
  • Other (3 brands)6%

The top 5 products take 54% of clicks — established leaders, but buyers still shop beyond them. 9 brands and 11 sellers compete here.

Brands

9 rising

was 7 a year ago

Sellers

11

Top 5 brand share

91%

#ProductBrandPriceRatingReviewsClick shareTrend

Product shelf

All 23 tracked products in this niche.

Reviews

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

What buyers love

Size-Overall20%

“Fit well”

Quality-Overall11%

“Good quality”

Stretchability/Expandability/Elasticity9%

“stretchy”

Water Resistance6%

“they're soft and water resistant”

Comfort-Overall5%

“They are super comfortable”

Adjustability/Rotatability/Reclining4%

“They're adjustable and cute colors”

Ease Of Use4%

“Easy to use”

Soft Feel4%

“They are super soft”

Design-Overall4%

“The design is super cute”

Value For Money3%

“These are a good value”

What buyers complain about

Size-Overall18%

“fits awkwardly”

Water Resistance12%

“Does not absorb water well - diaper always appears to look loaded down My daughter is a 4T in clothing”

Ease Of Use5%

“Just a little complex to put on”

Allergies5%

“my son broke-out with a rash from wearing this swim diaper”

Functionality-Overall5%

“These do NOT work at all”

Touch/Button Controls4%

“The buttons press on the hips a little”

Value For Money2%

“The price is higher per diaper”

Thickness2%

“The material is thick”

Stitch/Finish/Polish2%

“a bit tight at the seams”

Adjustability/Rotatability/Reclining2%

“they are not adjustable”

Top return reasons

  • Size-Overall71%
  • Advertised Vs Actual Product4%
  • Quality-Overall3%
  • Thin2%
  • Value For Money2%
  • Functionality-Overall2%
  • Material Quality2%
  • Age Suitability1%
  • Waist Fit1%
  • Thigh Fit1%

Data scraped July 8, 2026 · Marketplace baseline: 4.4★ avg rating · $22.71 median price · 2.2% median returns across 13,812 tracked niches.