mermaid costume kids
Skip itSoft demand (-27.0% this quarter) — this niche doesn't clear our bar today.
Review moat
Great306.07avg incumbent reviews — the moat a new listing must climb
Quality gap
Good4.3★avg incumbent rating — lower means beatable quality
Competition
Good45%top-5 click share — leaders hold, buyers still browse
Brand share
Good65%top-5 brand share — brands hold most of the demand
Price range
Good£7.13–£29.58cheapest to priciest tracked listing — scored on the share inside $15–$100
Returns
Good3.0%return rate — above 5% kills the launch gate
Avg price
Okay£11.88avg listing price — sweet spot $15–$100
Conversion
Bad1.7%search→purchase rate — share of searches ending in a sale
Market size
Bad£64K£64K/yr · 311K searches
Growth
Bad-27.0%90-day search growth — must beat 0% to launch
According to Flapen's Amazon United Kingdom niche tracking, mermaid costume kids is a £64K/yr Amazon United Kingdom market (311K searches/yr). The top 5 brands hold 65% of demand. Demand peaks in Mar–Oct. Verdict: Skip it — 45/100.
Data updated Jul 23, 2026 · scored weekly · How we score niches
mermaid costume kids market data
- Units sold / yr
- 4K–5K
- avg 100–250/product
- Revenue / yr
- £48K–£59K
- units × avg price
- Conversion rate
- 1.7%
- Avg BSR
- #429
- Page quality
- 0%
- Prime
- 100%
- Sponsored
- 90%
- Out of stock
- 10.1%
- Avg brand age
- 33 months
- Avg seller age
- 180 days
Competition & brand share
The top 5 products take 45% of clicks — established leaders, but buyers still shop beyond them.Brands
22 rising
Sellers
28
Top-5 brand share
65%
Top 20: 98%
Top-5 click share
45%
Top 20: 78%
Open market
28%
- AOOWU16%
- KumSoomliy16%
- MELAND15%
- BSBUY10%
- Kids4ever8%
- AYBUY6%
Demand & seasonality
Weekly Amazon search volume, last 104 weeks — -27.0% search growth over the last 90 days.Peak months: Mar, Oct · busiest ÷ quietest = 3.3×
Top mermaid costume kids search terms
- mermaid costume kids127K/yr
- mermaid costume31K/yr
- mermaid dress20K/yr
- mermaid dress for girls9K/yr
- little mermaid costume kids23K/yr
- ariel costume kids22K/yr
- kids mermaid costume10K/yr
- mermaid outfit7K/yr
- mermaid costumes6K/yr
- ariel costume11K/yr
Top mermaid costume kids 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.
All 24 tracked products in this niche — three views at once, no toggling.
Top sellers
by 90-day click share
KumSoomliy Girls Pincess Mermaid Costume Kids World Book Day Costume Dress Fancy Party Princess Dressing up Dresses Fairy Tales Childs Outfits Evening Clothes Blue with Accessories and Wig 5-6Y 130
KumSoomliy£12.694.4★156 rev
MELAND Mermaid Costume Kids Princess Costumes for Girls Gift Aged 5-6 Little Mermaid Dress Up for Girls World Book Day (M)
MELAND£14.244.0★480 rev
AOOWU Mermaid Costume Kids Mermaid Princess Dress Set with Accessories Little Mermaid Princess Costumes Fancy Dress Up for Age 3-9 Ariel Glitter Girls Costume for Halloween Cosplay
AOOWU£11.194.6★494 rev
BSBUY Mermaid Costume Kids Little Mermaid Princess Costumes for Girls Ariel Princess Costumes Fancy Dress Up Halloween Cosplay Birthday Party World Book Day Sequin Outfit(120)
BSBUY£9.073.8★31 rev
AOOWU Kids Mermaid Costume Set - Princess Dress with Accessories for Girls Age 3-9 Ariel Mermaid Glitter Girls Costume for Halloween & Cosplay
AOOWU£11.164.6★494 rev
Newest
by launch date
Xumplo Girls 3-Piece Mermaid Bikinis Set Kids Rainbow Fish Scale Swimming Costume with Skirt Tweens Bathing Suit 7-8 Years
Xumplo£12.525 rev
Princess Dress for Girls Party Dress Sequin Tulle Birthday Party Wedding Clothing Blue 130cm
Luckyou£15.777 rev
JiAmy Girls Mermaid Swimsuit One Piece Swimwear with Ruffle Straps Toddler Kids Bathing Suit Scale Print Swimming Costume for Rose-Mermaid 100
JiAmy£9.7815 rev
BSBUY Mermaid Costume Kids Little Mermaid Princess Costumes for Girls Ariel Princess Costumes Fancy Dress Up Halloween Cosplay Birthday Party World Book Day Sequin Outfit(120)
BSBUY£9.0731 rev
BSBUY Mermaid Costume Kids Little Mermaid Princess Fancy Dress Up Costume with Accessories and Wig Ariel Outfit Princess Mermaid Dress Halloween Cosplay Birthday Party Mermaid Sequin Outfit(4-5 Y)
BSBUY£10.30167 rev
Trending
90-day click momentumJiAmy Girls Mermaid Swimsuit One Piece Swimwear with Ruffle Straps Toddler Kids Bathing Suit Scale Print Swimming Costume for Rose-Mermaid 100
JiAmy£9.784.7★
Xumplo Girls 3-Piece Mermaid Bikinis Set Kids Rainbow Fish Scale Swimming Costume with Skirt Tweens Bathing Suit 7-8 Years
Xumplo£12.524.7★
Nidoul Kid Girls Unicorn Rainbow Mermaid Leggings Soft Stretchy Pants High Waist Slim Tights
Nidoul£9.354.6★
KumSoomliy Mermaid Costume Kids Princess World Book Day Costumes for Girls Gift Mermaid Dress Up for Girls Halloween Birthday Party Gift Fairy Tales Carnival World Book Day Outfit Dresses 3-4Y 110
KumSoomliy£10.194.4★
Kids4ever Girls Dresses Mermaid Dress Summer Sleeveless Crew Neck Twirly A-Line Swing Sundress for Party Birthday 4-5 Years
Kids4ever£11.724.5★
What buyers say about mermaid costume kids
What buyers praise and complain about, mined from review topics.What buyers love
“Fited brilliant”
“she loved it lots of accessories too included good value for money”
“Really good quality”
“colour”
“Really soft and good quality”
“breathable polyester rather than itchy materials often found in budget costumes”
“Daughter loves this very durable”
“comfortable”
“Easy Wearability: The pullover style with an elasticated waist is brilliant for quick changes”
“The design is cute”
What buyers complain about
“Awful quality”
“Tail is quite long though”
“The crown and wand have already snapped after only a few times using them”
“Cheap material”
“Only downside is some of the jewellery needs glueing back together i. e the earrings”
“Flimsy tiara and wand”
Top return reasons
Common questions
- Is mermaid costume kids profitable to sell on Amazon United Kingdom?
- The niche generates £64K/yr across 42 tracked products. 0 of 9 products launched in the last 360 days are still selling. 90-day search growth is -27.0%. Flapen's verdict: Skip it (45/100).
- How competitive is the mermaid costume kids niche?
- 22 brands and 28 sellers compete. The top 5 products take 45% of clicks and top 5 brands hold 65% of demand.
- What do buyers complain about in mermaid costume kids?
- Top complaints mined from reviews: Quality-Overall, Size-Overall, Durability. The return rate is 3.0%.
- When does demand for mermaid costume kids peak?
- Demand peaks in Mar–Oct; the busiest month runs 3.3× the quietest.
- What does it cost to enter the mermaid costume kids niche?
- Listings span £7.13–£29.58; the average listing price is £11.88 (sweet spot $15–$100). The average incumbent carries 306 reviews — the moat a new listing must climb.