---
title: "Swim Diaper Size 5 — $2.4M/yr Amazon US Niche (2026) - Flapen"
canonical_url: "https://flapen.com/research/us/clothing-shoes-jewelry/swim-diaper-size-5"
last_updated: "2026-08-09T23:30:51.204Z"
locale: en
meta:
description: "Niche score 62/100 · $2.4M/yr market · 621K searches/yr · $16.41 avg price. Clears our launch bar. Data updated Jul 2026."
"og:description": "Niche score 62/100 · $2.4M/yr market · 621K searches/yr · $16.41 avg price. Clears our launch bar. Data updated Jul 2026."
"og:title": "Swim Diaper Size 5 — $2.4M/yr Amazon US Niche (2026) - Flapen"
---
# **swim diaper size 5**
**Launch it**
A $2.4M/yr market growing +187.0% this quarter with returns at 0.5% — clears our launch bar.
Market size 95Growth 97Conversion 100Competition 23Returns 98Price range 39Avg price 79Brand share 4Review moat 36Quality gap 21
**Conversion**
**Incredible****23.4%**
search→purchase rate — share of searches ending in a sale
**Returns**
**Incredible****0.5%**
return rate — above 5% kills the launch gate
**Growth**
**Incredible****+187.0%**
90-day search growth — must beat 0% to launch
**Market size**
**Incredible****$2.4M**
$2.4M/yr · 621K searches
**Avg price**
**Great****$16.41**
avg listing price — sweet spot $15–$100
**Price range**
**Okay****$6.42–$20.40**
cheapest to priciest tracked listing — scored on the share inside $15–$100
**Review moat**
**Okay****2,910.08**
avg incumbent reviews — the moat a new listing must climb
**Competition**
**Bad****72%**
top-5 click share — a locked-up shelf
**Quality gap**
**Bad****4.7★**
avg incumbent rating — lower means beatable quality
**Brand share**
**Bad****98%**
top-5 brand share — brand-locked demand
**Signals**[** Trending**](https://flapen.com/research/niches?market=us&signal=trending "Search growth > 100% (90d)")
According to Flapen's Amazon United States niche tracking, swim diaper size 5 is a $2.4M/yr Amazon United States market (621K searches/yr). The top 5 brands hold 98% of demand. Demand peaks in May–Jun–Jul. Verdict: Launch it — 62/100.
Data updated Jul 8, 2026 · scored weekly · [~~How we score niches ~~](https://flapen.com/research/methodology)
## **swim diaper size 5 market data**
- **Units sold / yr**
- **125K–150K**
- avg 6,000–8,000/product
- **Revenue / yr**
- **$2.1M–$2.5M**
- units × avg price
- **Conversion rate**
- **23.4%**
- **Avg BSR**
- **#23**
- **Page quality**
- **0%**
- **Prime**
- **100%**
- **Sponsored**
- **100%**
- **Out of stock**
- **11.5%**
- **Avg brand age**
- **51 months**
- **Avg seller age**
- **166 days**
## **Competition & brand share**
The top 5 products capture 72% of clicks — a locked-up shelf that new listings rarely crack.
**Brands**
**6 **▼falling
**Sellers**
**7**
**Top-5 brand share**
**98%**
Top 20: 100%
**Top-5 click share**
**72%**
Top 20: 100%
**Open market**
**0%**
- MooMoo Baby45% - Pampers31% - Hello Bello15% - MomEasier5% - Joyo roy2% - Nuby2% - Open — no brand owns it (0%)
## **Demand & seasonality**
Weekly Amazon search volume, last 104 weeks — +187.0% search growth over the last 90 days.
35K25KSpike '25Spike '26 seasonSepDecMarJunAugNovMarMay
Peak months: May, Jun, Jul · busiest ÷ quietest = 10.5×
[**Open Trend **](https://flapen.com/research/us/clothing-shoes-jewelry/swim-diaper-size-5/trend)
## **Top swim diaper size 5 search terms**
- **swim diapers size 5**236K/yr+205.5%1.4% conv. - **swim diapers size 6**139K/yr+176.9%13.0% conv. - **swim diapers size 7**58K/yr+197.6%11.0% conv. - **size 5 swim diapers**31K/yr+183.3%1.2% conv. - **water diapers size 5**19K/yr+219.7%1.5% conv. - **size 6 swim diapers**16K/yr+155.4%15.8% conv. - **swimming diapers size 5**17K/yr+170.3%0.7% conv. - **little swimmers size 5**12K/yr+212.7%0.3% conv. - **water diapers size 6**13K/yr+202.7%7.9% conv. - **swimming diapers size 6**11K/yr+147.6%7.8% conv. [**All search terms **](https://flapen.com/research/us/clothing-shoes-jewelry/swim-diaper-size-5/search-terms)
## **Top swim diaper size 5 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.
0%10%$238K20%$476K30%$714K40%$952K101001K10K100K Reviews — right = deep review moatMarket share (90d) ≈ est. sales
Beatable (≤4.3★) Contested Strong incumbent (>4.7★)
All 13 tracked products in this niche — three views at once, no toggling.
### **Top sellers**
by 90-day click share
[1**Pampers Splashers Swim Diapers Size 6+ 15 Count Disposable Swim Diapers Contains Mess No Swell**Pampers**$9.87**4.8★31,443 rev](https://www.amazon.com/dp/B0GMS6LJ93) [2**MooMoo Baby Reusable Swim Diapers 3 Pcs Waterproof Swimming Diapers for Baby Swim Lesson**MooMoo Baby**$19.04**4.7★483 rev](https://www.amazon.com/dp/B0D69XS3DF) [3**MooMoo Baby Reusable Swim Diapers 3 Pcs Waterproof Swimming Diapers for Baby Swim Lesson**MooMoo Baby**$19.14**4.7★483 rev](https://www.amazon.com/dp/B0D69Y45SB) [4**MooMoo Baby Reusable Swim Diapers 3 Pcs Waterproof Swimming Diapers for Baby Swim Lesson 5T**MooMoo Baby**$18.67**4.7★483 rev](https://www.amazon.com/dp/B0DQXRLQWC) [5**Hello Bello Premium Swim Diapers I Affordable and Eco-Friendly Disposable Swim Dipes for Babies and Kids I Size Medium**Hello Bello**$13.41**4.6★1,260 rev](https://www.amazon.com/dp/B0966DJR57)
**~~View all top sellers →~~**
### **Newest**
by launch date
[**MomEasier Swim Diapers 3 Pcs Reusable Swimming Diaper for Baby Boys and Girls 2-5T Green**MomEasier**$20.40**26 rev1mo ago](https://www.amazon.com/dp/B0H1MJ53CX) [**Pampers Splashers Swim Diapers Size 6+ 15 Count Disposable Swim Diapers Contains Mess No Swell**Pampers**$9.87**31,443 rev3mo ago](https://www.amazon.com/dp/B0GMS6LJ93) [**Nuby Swim Pants for Toddlers - 5 Pack - Toddler Swim Diapers with Stretchy Waistline Tear-Away Sides Water-Resistant Outer Layer & Leak-Preventing Cuffs - Size Large (26-37 lbs)**Nuby**$6.42**46 rev5mo ago](https://www.amazon.com/dp/B0GLR2Z9DM) [**MooMoo Baby Reusable Swim Diapers 3 Pcs Waterproof Swimming Diapers for Baby Swim Lesson 5T**MooMoo Baby**$18.67**483 rev1y ago](https://www.amazon.com/dp/B0DQXRLQWC) [**MooMoo Baby Reusable Swim Diapers 3 Pcs Waterproof Swimming Diapers for Baby Swim Lesson 5T**MooMoo Baby**$18.48**483 rev1y ago](https://www.amazon.com/dp/B0DQXQCDPD)
**~~View all new products →~~**
### **Trending**
90-day click momentum
[**MomEasier Swim Diapers 3 Pcs Reusable Swimming Diaper for Baby Boys and Girls 2-5T Green**MomEasier**$20.40**4.6★**▲ 27%**](https://www.amazon.com/dp/B0H1MJ53CX) [**Pampers Splashers Swim Diapers Size 6+ 15 Count Disposable Swim Diapers Contains Mess No Swell**Pampers**$9.87**4.8★**▲ 27%**](https://www.amazon.com/dp/B0GMS6LJ93) [**MooMoo Baby Reusable Swim Diapers 3 Pcs Waterproof Swimming Diapers for Baby Swim Lesson**MooMoo Baby**$19.05**4.7★**▲ 27%**](https://www.amazon.com/dp/B0D6B2YDW8) [**MooMoo Baby Reusable Swim Diapers 3 Pcs Waterproof Swimming Diapers for Baby Swim Lesson**MooMoo Baby**$19.10**4.7★**▲ 24%**](https://www.amazon.com/dp/B0D69YH7ZG) [**MooMoo Baby Reusable Swim Diapers 3 Pcs Waterproof Swimming Diapers for Baby Swim Lesson**MooMoo Baby**$19.04**4.7★**▲ 24%**](https://www.amazon.com/dp/B0D69XS3DF)
**~~View all trending →~~**
## **What buyers say about swim diaper size 5**
What buyers praise and complain about, mined from review topics.
### **What buyers love **
**Size-Overall**18%
*“fit securely”*
**Stretchability/Expandability/Elasticity**12%
*“the elastic seems comfortable”*
**Quality-Overall**10%
*“These are well made”*
**Water Resistance**7%
*“secure so that your little one can enjoy play time in the water”*
**Design-Overall**7%
*“The designs are pretty cute”*
**Comfort-Overall**6%
*“These are comfortable”*
**Soft Feel**6%
*“I find them softer than some of the other competing brands out there”*
**Value For Money**6%
*“these are definitely worth considering”*
**Ease Of Use**4%
*“Very convenient”*
**Leak-Proof**2%
*“absorb well without leaking on the way to swim lessons if he happens to wet himself before getting into the pool”*
### **What buyers complain about **
**Water Resistance**8%
*“otherwise it would just soak up all the pool water”*
**Leak-Proof**8%
*“these are not leak proof”*
**Size-Overall**6%
*“They might be a little too big still for my baby come summer”*
**Value For Money**6%
*“I do find these a bit expensive as each swim diaper is well over a dollar”*
**Functionality-Overall**5%
*“These do NOT work at all”*
**Allergies**2%
*“.He has eczema”*
**Absorbency**2%
*“They dont absorb water either”*
**Thickness**2%
*“The material is thick”*
**Stitch/Finish/Polish**2%
*“a bit tight at the seams”*
**Adjustability/Rotatability/Reclining**2%
*“they are not adjustable”*
### **Top return reasons **
**Size-Overall**73%
**Advertised Vs Actual Product**4%
**Waist Fit**3%
**Quality-Overall**3%
**Hip Fit**2%
**Absorbency**2%
**Material Quality**2%
**Thigh Fit**2%
**Functionality-Overall**2%
**Leak-Proof**1%
## **Common questions**
- **Is swim diaper size 5 profitable to sell on Amazon United States?**
- The niche generates $2.4M/yr across 13 tracked products. 2 of 3 products launched in the last 360 days are still selling. 90-day search growth is +187.0%. Flapen's verdict: Launch it (62/100).
- **How competitive is the swim diaper size 5 niche?**
- 6 brands and 7 sellers compete. The top 5 products take 72% of clicks and top 5 brands hold 98% of demand.
- **What do buyers complain about in swim diaper size 5?**
- Top complaints mined from reviews: Water Resistance, Leak-Proof, Size-Overall. The return rate is 0.5%.
- **When does demand for swim diaper size 5 peak?**
- Demand peaks in May–Jun–Jul; the busiest month runs 10.5× the quietest.
- **What does it cost to enter the swim diaper size 5 niche?**
- Listings span $6.42–$20.40; the average listing price is $16.41 (sweet spot $15–$100). The average incumbent carries 2,910 reviews — the moat a new listing must climb.
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