---
title: "mermaid costume for girls — Niche Verdict: Skip it (49/100) | Amazon United States - Flapen"
canonical_url: "https://flapen.com/amazon/research/us/clothing-shoes-jewelry/mermaid-costume-for-girls"
last_updated: "2026-07-13T20:53:53.726Z"
locale: en
meta:
  description: "weak search conversion (0.8%) — mermaid costume for girls doesn't clear our bar today."
  "og:description": "weak search conversion (0.8%) — mermaid costume for girls doesn't clear our bar today."
  "og:title": "mermaid costume for girls — Niche Verdict: Skip it (49/100) | Amazon United States - Flapen"
---

Back to Flapen home

# **mermaid costume for girls**

**Skip it**

Weak search conversion (0.8%) — this niche doesn't clear our bar today.

Market size 39Growth 16Conversion 9Competition 92Returns 43Price range 83Avg price 94Brand share 85Review moat 42Quality gap 23

**Avg price**

**Great****$22.53**

avg listing price — sweet spot $15–$100

**Competition**

**Great****23%**

top-5 click share — an open shelf

**Brand share**

**Great****50%**

top-5 brand share — no brand owns this niche

**Price range**

**Great****$8.04–$53.12**

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

**Returns**

**Okay****3.8%**

return rate — above 6% kills the launch gate

**Review moat**

**Okay****2,319.63**

avg incumbent reviews — the moat a new listing must climb

**Market size**

**Okay****$201K**

$201K/yr · 1.2M searches

**Quality gap**

**Bad****4.6★**

avg incumbent rating — lower means beatable quality

**Growth**

**Bad****-17.3%**

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

**Conversion**

**Bad****0.8%**

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

## **Competition**

Clicks spread well past the top 5 (23% combined) — an open shelf where new products get seen.

**Brands**

**45 **—flat

**Sellers**

**59**

**Top-5 brand share**

**50%**

**Open market**

**46%**

- Disney20% - Fylytota13% - Meland9% - Spooktacular Creations5% - Fun Costumes4% - Danvren4%

## **Product shelf**

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

0%2%$4K4%$8K6%$12K8%$16K101001K10K100K Reviews — right = deep review moatMarket share (90d) ≈ est. sales

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

All 86 tracked products in this niche — three views at once, no toggling.

### **Top sellers**

by 90-day click share

[1![Fylytota Girls Mermaid Dress Little Mermaid Costume Princess Sequin Sling Tutu Dress for Toddler Kids Birthday Party Turquoise](https://m.media-amazon.com/images/I/3196YtutV+L.jpg)**Fylytota Girls Mermaid Dress Little Mermaid Costume Princess Sequin Sling Tutu Dress for Toddler Kids Birthday Party Turquoise**Fylytota**$25.12**4.8★39 rev](https://www.amazon.com/dp/B0FKYDG2JJ) [2![Meland Mermaid Dress - Little Mermaid Costume with Bag for Girls 3-10 Princess Dress Up Clothes for Birthday Gift Halloween Costume for Toddler Kids 3 4 5 6 7 8 9 10 Years Old](https://m.media-amazon.com/images/I/41DYJBktbcL.jpg)**Meland Mermaid Dress - Little Mermaid Costume with Bag for Girls 3-10 Princess Dress Up Clothes for Birthday Gift Halloween Costume for Toddler Kids 3 4 5 6 7 8 9 10 Years Old**Meland**$21.85**4.3★1,275 rev](https://www.amazon.com/dp/B0C7QZ9X38) [3![Fun Costumes - Disney The Little Mermaid Ariel Costume Princess of the Sea for Fantasy Cosplay Beach Theme Party & Dress Up Small](https://m.media-amazon.com/images/I/41InyIT2mLL.jpg)**Fun Costumes - Disney The Little Mermaid Ariel Costume Princess of the Sea for Fantasy Cosplay Beach Theme Party & Dress Up Small**Fun Costumes**$53.12**4.2★78 rev](https://www.amazon.com/dp/B0B77ZDJ9Z) [4![Fylytota Girls Mermaid Dress Little Mermaid Costume Princess Sequin Sling Tutu Dress for Toddler Kids Birthday Party Turquoise](https://m.media-amazon.com/images/I/3196YtutV+L.jpg)**Fylytota Girls Mermaid Dress Little Mermaid Costume Princess Sequin Sling Tutu Dress for Toddler Kids Birthday Party Turquoise**Fylytota**$24.96**4.8★39 rev](https://www.amazon.com/dp/B0FKYLH8QQ) [5![Meland Mermaid Costume for Girls - Light Up Halloween Costume for Kids Toddler 3-10 Princess Dress Up for Girl Birthday Gift Mermaid Dress for Girls Aged 3-10 Years Old (5-6 Years)](https://m.media-amazon.com/images/I/417oEJRSVvL.jpg)**Meland Mermaid Costume for Girls - Light Up Halloween Costume for Kids Toddler 3-10 Princess Dress Up for Girl Birthday Gift Mermaid Dress for Girls Aged 3-10 Years Old (5-6 Years)**Meland**$25.68**4.5★102 rev](https://www.amazon.com/dp/B0FR5HC594)

**~~View all top sellers →~~**

### **Newest**

by launch date

[![Disney Little Mermaid Girls Princess Dress Nightgown Fantasy Gown Soft & Cute Pajamas for Kids](https://m.media-amazon.com/images/I/41vCScllsDL.jpg)**Disney Little Mermaid Girls Princess Dress Nightgown Fantasy Gown Soft & Cute Pajamas for Kids**Disney**$25.48**21,893 rev2mo ago](https://www.amazon.com/dp/B0FV3WDQ46) [![Disney Little Mermaid Girls Princess Dress Nightgown Fantasy Gown Soft & Cute Pajamas for Kids](https://m.media-amazon.com/images/I/41vCScllsDL.jpg)**Disney Little Mermaid Girls Princess Dress Nightgown Fantasy Gown Soft & Cute Pajamas for Kids**Disney**$26.53**21,893 rev2mo ago](https://www.amazon.com/dp/B0FV3VJ96R) [![Disney Girls Nightgown Fantasy Gown Comfortable Nightwear Soft & Cute Pajamas for Kids UNDER THE WATER 2 4T](https://m.media-amazon.com/images/I/41MwQWUKgAL.jpg)**Disney Girls Nightgown Fantasy Gown Comfortable Nightwear Soft & Cute Pajamas for Kids UNDER THE WATER 2 4T**Disney**$11.87**8,990 rev2mo ago](https://www.amazon.com/dp/B08JS6RCPZ) [![Disney Girls Nightgown Fantasy Gown Comfortable Nightwear Soft & Cute Pajamas for Kids UNDER THE WATER 2 3T](https://m.media-amazon.com/images/I/41MwQWUKgAL.jpg)**Disney Girls Nightgown Fantasy Gown Comfortable Nightwear Soft & Cute Pajamas for Kids UNDER THE WATER 2 3T**Disney**$13.10**8,990 rev2mo ago](https://www.amazon.com/dp/B08JRR8PLR) [![G.C Mermaid Costume for Girls Ages 2-7 Light Blue Dress Up Set with Wig Crown Wand Princess Party Halloween Birthday Cosplay Outfit](https://m.media-amazon.com/images/I/51Uo90dHPfL.jpg)**G.C Mermaid Costume for Girls Ages 2-7 Light Blue Dress Up Set with Wig Crown Wand Princess Party Halloween Birthday Cosplay Outfit**G.C**$27.23**32 rev5mo ago](https://www.amazon.com/dp/B0GLDYR77T)

**~~View all new products →~~**

### **Trending**

90-day click momentum

[![G.C Mermaid Costume for Girls Ages 2-7 Light Blue Dress Up Set with Wig Crown Wand Princess Party Halloween Birthday Cosplay Outfit](https://m.media-amazon.com/images/I/51Uo90dHPfL.jpg)**G.C Mermaid Costume for Girls Ages 2-7 Light Blue Dress Up Set with Wig Crown Wand Princess Party Halloween Birthday Cosplay Outfit**G.C**$27.23**4.3★**▲ 400%**](https://www.amazon.com/dp/B0GLDYR77T) [![Disney Little Mermaid Girls Princess Dress Nightgown Fantasy Gown Soft & Cute Pajamas for Kids](https://m.media-amazon.com/images/I/41vCScllsDL.jpg)**Disney Little Mermaid Girls Princess Dress Nightgown Fantasy Gown Soft & Cute Pajamas for Kids**Disney**$25.48**4.8★**▲ 379%**](https://www.amazon.com/dp/B0FV3WDQ46) [![Mermaid Princess Costume Princess Dress Up Blue Ball Gown with Hairbow for Adult Women (XS)](https://m.media-amazon.com/images/I/41qhaOdaydL.jpg)**Mermaid Princess Costume Princess Dress Up Blue Ball Gown with Hairbow for Adult Women (XS)**Saniplaycos**$35.15**3.9★**▲ 379%**](https://www.amazon.com/dp/B0DN1G3196) [![Disney The Little Mermaid Ariel Baby Girl Dress Blue Under the Sea Sleeveless Casual Summer Sundress Infant Birthday Party Outfits Clothes 6-9 Months](https://m.media-amazon.com/images/I/31s-5W1bC8L.jpg)**Disney The Little Mermaid Ariel Baby Girl Dress Blue Under the Sea Sleeveless Casual Summer Sundress Infant Birthday Party Outfits Clothes 6-9 Months**Disney**$16.40**4.8★**▲ 376%**](https://www.amazon.com/dp/B0GDZPPZF4) [![Fylytota Girls Mermaid Dress Little Mermaid Costume Princess Sequin Sling Tutu Dress for Toddler Kids Birthday Party Turquoise](https://m.media-amazon.com/images/I/3196YtutV+L.jpg)**Fylytota Girls Mermaid Dress Little Mermaid Costume Princess Sequin Sling Tutu Dress for Toddler Kids Birthday Party Turquoise**Fylytota**$25.12**4.8★**▲ 370%**](https://www.amazon.com/dp/B0FKYDG2JJ)

**~~View all trending →~~**

## **Demand & seasonality**

Weekly Amazon search volume, last 104 weeks — -17.3% search growth over the last 90 days.

125K75KSpike '24Spike '25Prime Day '25Spike '26 seasonSepDecMarJunAugNovMarMay

Peak months: Sep, Oct · busiest ÷ quietest = 8.4×

## **Reviews**

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

### **What buyers love **

**Size-Overall**19%

*“The sizing felt accurate”*

**Quality-Overall**15%

*“Good quality”*

**Value For Money**10%

*“Good value”*

**Gifting Purpose**9%

*“Amazing gift”*

**Advertised Vs Actual Product**5%

*“As described”*

**Color**5%

*“Cute colors”*

**Fun/Entertainment Experience**4%

*“also keeps kids entertained”*

**Material Quality**4%

*“It was very soft material”*

**Durability**3%

*“it still looks brand new”*

**Brightness/Shine/Glow**3%

*“has that fun sparkle kids get excited about”*

### **What buyers complain about **

**Size-Overall**37%

*“Runs very small”*

**Quality-Overall**16%

*“Not well made”*

**Durability**8%

*“But Got broken after 1 hour use”*

**Advertised Vs Actual Product**3%

*“the dress doesnt look anything like the picture”*

**Stitch/Finish/Polish**3%

*“The seams were coming undone”*

**Assembly/Installation**3%

*“The crown is impossible to put together”*

**Allergies**2%

*“Ruffles on puffed sleeves leaves brush burn rash”*

**Brightness/Shine/Glow**2%

*“Doesn't glow well”*

**Material Quality**2%

*“Cheaply made”*

**Thin**1%

*“very thin”*

### **Top return reasons **

**Size-Overall**62%

**Length**6%

**Material Quality**4%

**Quality-Overall**4%

**Chest Fit**4%

**Advertised Vs Actual Product**3%

**Waist Fit**2%

**Value For Money**2%

**Shoulder Fit**1%

**Defective Material/Parts**1%