---
title: "Mermaid Costume for Girls — Amazon US Product Research"
canonical_url: "https://flapen.com/research/us/clothing-shoes-jewelry/mermaid-costume-for-girls"
last_updated: "2026-08-12T09:17:38.758Z"
locale: en
meta:
description: "Amazon product research for mermaid costume for girls: $17K/mo market, demand, competition, pricing, reviews & the verdict. Know if it's worth selling — Flapen."
"og:description": "Amazon product research for mermaid costume for girls: $17K/mo market, demand, competition, pricing, reviews & the verdict. Know if it's worth selling — Flapen."
"og:title": "Mermaid Costume for Girls — Amazon US Product Research"
---
# **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 40Price 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
**Review moat**
**Okay****2,319.63**
avg incumbent reviews — the moat a new listing must climb
**Returns**
**Okay****3.8%**
return rate — above 5% kills the launch gate
**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
## **Is mermaid costume for girls profitable on Amazon?**
According to Flapen's Amazon United States niche tracking, mermaid costume for girls is a $201K/yr Amazon United States market (1.2M searches/yr). The top 5 brands hold 50% of demand. Demand peaks in Sep–Oct. Verdict: Skip it — 49/100.
Data updated Jul 10, 2026 · scored weekly · [~~How we score niches ~~](https://flapen.com/research/methodology)
## **mermaid costume for girls market size & sales**
Units sold, revenue, conversion and listing quality across the tracked shelf.
- **Units sold / yr**
- **10K–13K**
- avg 100–250/product
- **Revenue / yr**
- **$225K–$282K**
- units × avg price
- **Conversion rate**
- **0.8%**
- **Avg BSR**
- **#471**
- **Page quality**
- **0%**
- **Prime**
- **97%**
- **Sponsored**
- **94%**
- **Out of stock**
- **6.4%**
- **Avg brand age**
- **40 months**
- **Avg seller age**
- **173 days**
## **Competition: brands, sellers & click share**
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%**
Top 20: 81%
**Top-5 click share**
**23%**
Top 20: 51%
**Open market**
**46%**
- Disney20% - Fylytota13% - Meland9% - Spooktacular Creations5% - Fun Costumes4% - Danvren4%
## **mermaid costume for girls 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×
[**Open Trend **](https://flapen.com/research/us/clothing-shoes-jewelry/mermaid-costume-for-girls/trend)
## **Top mermaid costume for girls search terms shoppers use**
The exact queries shoppers type, with yearly volume, growth and conversion.
- **little mermaid dress**87K/yr+11.9%0.5% conv. - **mermaid costume for girls**364K/yr-43.3%1.0% conv. - **ariel costume for girls**216K/yr-44.5%0.6% conv. - **ariel costume**82K/yr+18.5%0.1% conv. - **little mermaid costume**133K/yr-35.9%0.4% conv. - **mermaid dress up**30K/yr+3.3%1.5% conv. - **traje de sirena para nia**16K/yr+35.0%0.2% conv. - **little mermaid dress for girls**9K/yr+13.3%0.3% conv. - **disfraz de sirena para nia**16K/yr+8.2%0.3% conv. - **little mermaid costume for girls**31K/yr-22.5%1.0% conv. [**All search terms **](https://flapen.com/research/us/clothing-shoes-jewelry/mermaid-costume-for-girls/search-terms)
## **Top mermaid costume for girls products & what they sell for**
Every tracked product — its share of the shelf, its review moat, and what it sells for.
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 24 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**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**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**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**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)**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**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**Disney**$26.53**21,893 rev2mo ago](https://www.amazon.com/dp/B0FV3VJ96R) [**Disney Princess Ariel Little Mermaid Toddler to Tween Girl Dresses Ruffle Short Sleeve Tutu Sparkle Tulle Skirt Summer Mesh Clothes Birthday Party Gift Casual Outfit Gradient Green 3-4T**Disney**$26.64**934 rev7mo ago](https://www.amazon.com/dp/B0G6KN6GG8) [**Danvren Mermaid Princess Dress for Toddler Girls Sleeveless Ruffle Sleeve Tulle Dresses Casual Summer Outfit for Girl 3-6 Years**Danvren**$18.27**60 rev9mo ago](https://www.amazon.com/dp/B0FSKR8P98) [**Mskseciy Mermaid Dress Mermaid Tail Costume Girls Princess Dress with Crown for Girl 3-8 Birthday Gifts Xmas Halloween Costumes (Green 5-6 Years)**Mskseciy**$17.82**48 rev9mo ago](https://www.amazon.com/dp/B0FS7F276B)
**~~View all new products →~~**
### **Trending**
90-day click momentum
[**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) [**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) [**Disney Little Mermaid Girls Princess Dress Nightgown Fantasy Gown Soft & Cute Pajamas for Kids**Disney**$26.53**4.8★**▲ 359%**](https://www.amazon.com/dp/B0FV3VJ96R) [**Disney Princess Ariel Little Mermaid Toddler to Tween Girl Dresses Ruffle Short Sleeve Tutu Sparkle Tulle Skirt Summer Mesh Clothes Birthday Party Gift Casual Outfit Gradient Green 3-4T**Disney**$26.64**4.6★**▲ 335%**](https://www.amazon.com/dp/B0G6KN6GG8) [**Danvren Mermaid Princess Dress for Toddler Girls Sleeveless Ruffle Sleeve Tulle Dresses Casual Summer Outfit for Girl 3-6 Years**Danvren**$18.27**4.5★**▲ 320%**](https://www.amazon.com/dp/B0FSKR8P98)
**~~View all trending →~~**
## **What reviews say buyers love and hate about mermaid costume for girls**
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%
## **Common mermaid costume for girls questions**
- **Is mermaid costume for girls profitable to sell on Amazon United States?**
- The niche generates $201K/yr across 86 tracked products. 7 of 22 products launched in the last 360 days are still selling. 90-day search growth is -17.3%. Flapen's verdict: Skip it (49/100).
- **How competitive is the mermaid costume for girls niche?**
- 45 brands and 59 sellers compete. The top 5 products take 23% of clicks and top 5 brands hold 50% of demand.
- **What do buyers complain about in mermaid costume for girls?**
- Top complaints mined from reviews: Size-Overall, Quality-Overall, Durability. The return rate is 3.8%.
- **When does demand for mermaid costume for girls peak?**
- Demand peaks in Sep–Oct; the busiest month runs 8.4× the quietest.
- **What does it cost to enter the mermaid costume for girls niche?**
- Listings span $8.04–$53.12; the average listing price is $22.53 (sweet spot $15–$100). The average incumbent carries 2,320 reviews — the moat a new listing must climb.
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