---
title: "18 Month Halloween Costume Girl — $0/yr Amazon US Niche (2026) - Flapen"
canonical_url: "https://flapen.com/research/us/clothing-shoes-jewelry/18-month-halloween-costume-girl"
last_updated: "2026-08-08T01:16:38.293Z"
locale: en
meta:
description: "Niche score 40/100 · $0/yr market · 196K searches/yr · $22.58 avg price. Doesn't clear our bar today. Data updated Jul 2026."
"og:description": "Niche score 40/100 · $0/yr market · 196K searches/yr · $22.58 avg price. Doesn't clear our bar today. Data updated Jul 2026."
"og:title": "18 Month Halloween Costume Girl — $0/yr Amazon US Niche (2026) - Flapen"
---
# **18 month halloween costume girl**
**Skip it**
A small market ($0/yr) — this niche doesn't clear our bar today.
Market size 0Growth 16Conversion 0Competition 81Returns 9Price range 84Avg price 94Brand share 95Review moat 68Quality gap 25
**Brand share**
**Incredible****39%**
top-5 brand share — no brand owns this niche
**Avg price**
**Great****$22.58**
avg listing price — sweet spot $15–$100
**Price range**
**Great****$9.77–$46.89**
cheapest to priciest tracked listing — scored on the share inside $15–$100
**Competition**
**Great****34%**
top-5 click share — an open shelf
**Review moat**
**Good****770.96**
avg incumbent reviews — the moat a new listing must climb
**Quality gap**
**Okay****4.6★**
avg incumbent rating — lower means beatable quality
**Growth**
**Bad****-17.2%**
90-day search growth — must beat 0% to launch
**Returns**
**Bad****9.5%**
return rate — above 5% kills the launch gate
**Market size**
**Bad****$0**
$0/yr · 196K searches
**Conversion**
**Bad****0.0%**
search→purchase rate — share of searches ending in a sale
**Signals**[** No Dominant Brand**](https://flapen.com/research/niches?market=us&signal=no_dominant_brand "Top brand's click share < 20%") [** High Returns**](https://flapen.com/research/niches?market=us&signal=high_returns "Return rate > 5%")
According to Flapen's Amazon United States niche tracking, 18 month halloween costume girl is a $0/yr Amazon United States market (196K searches/yr). The top 5 brands hold 39% of demand. Demand peaks in Sep–Oct. Verdict: Skip it — 40/100.
Data updated Jul 10, 2026 · scored weekly · [~~How we score niches ~~](https://flapen.com/research/methodology)
## **18 month halloween costume girl market data**
- **Units sold / yr**
- **1K–1K**
- avg 0–100/product
- **Revenue / yr**
- **$23K–$28K**
- units × avg price
- **Conversion rate**
- **0.0%**
- **Avg BSR**
- **#432**
- **Page quality**
- **0%**
- **Prime**
- **100%**
- **Sponsored**
- **83%**
- **Out of stock**
- **10.6%**
- **Avg brand age**
- **41 months**
- **Avg seller age**
- **182 days**
## **Competition & brand share**
Clicks spread well past the top 5 (34% combined) — an open shelf where new products get seen.
**Brands**
**20 **▲rising
**Sellers**
**25**
**Top-5 brand share**
**39%**
Top 20: 100%
**Top-5 click share**
**34%**
Top 20: 94%
**Open market**
**55%**
- Gakizon10% - Dcohmch8% - Thorn Tree7% - LXKIKMM7% - Yruiz7% - ZOELNIC6%
## **Demand & seasonality**
Weekly Amazon search volume, last 95 weeks — -17.2% search growth over the last 90 days.
120K80KSpike '24Spike '25Prime Day '25Spike '26 seasonSepDecMarJunAugNovMay
Peak months: Sep, Oct · busiest ÷ quietest = 284.2×
[**Open Trend **](https://flapen.com/research/us/clothing-shoes-jewelry/18-month-halloween-costume-girl/trend)
## **Top 18 month halloween costume girl search terms**
- **18-24 month halloween costume girl**42K/yr+74.7%0.0% conv. - **baby costumes 18-24 months**12K/yr-21.2%0.0% conv. - **disfraz para bebe de 1 ao**6K/yr-5.6%0.0% conv. - **costume 18 months**5K/yr+9.7%0.0% conv. - **18 month girl costume**11K/yr-60.9%0.0% conv. - **12-18 month boy halloween costume**6K/yr+784.6%0.0% conv. - **baby costume 18-24 months**10K/yr-69.5%0.0% conv. - **18 month boy costume**9K/yr-68.8%0.0% conv. - **18 month costume girl**11K/yr-41.8%0.0% conv. - **1 year old costume boy**9K/yr-33.3%0.0% conv. [**All search terms **](https://flapen.com/research/us/clothing-shoes-jewelry/18-month-halloween-costume-girl/search-terms)
## **Top 18 month halloween costume girl 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%2%$04%$06%$08%$0101001K10K 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**Thorn Tree Kids Firefighter Outfit Short Sleeve T-Shirt Suspender Pants Overalls Halloween Birthday Outfits (Blue 18-24 Months)**Thorn Tree**$17.31**4.7★167 rev](https://www.amazon.com/dp/B0FMYB6N25) [2**LXKIKMM Baby Cowboy Cowgirl Outfit Rodeo Halloween Costume 18-24 Months**LXKIKMM**$19.60**4.6★1,596 rev](https://www.amazon.com/dp/B072MGV8J5) [3**Yruiz Newborn Baby Girl Halloween Cowgirl Costume Romper Dress Outfits Skirt Set Birthday Bodysuit With Headband18-24 Months**Yruiz**$18.62**3.9★10 rev](https://www.amazon.com/dp/B0F53KSTJB) [4**Gakizon Baby Boy Halloween outfits Infant baby Toddler Boy Chucky Outfit Good guy Outfits**Gakizon**$33.43**4.6★256 rev](https://www.amazon.com/dp/B0D8ZN2HZ4) [5**ZOELNIC Baby Boy Romper Newborn Onesie Cute Baby Girl One-Piece Jumpsuits Outfits Clothes(green 18-24M)**ZOELNIC**$19.43**4.8★147 rev](https://www.amazon.com/dp/B0D7ZQXPBV)
**~~View all top sellers →~~**
### **Newest**
by launch date
[**XLSXEXCL 2PCS Baby Chef Outfit Set Baby Apron and Chef Hat for Newborn Photography Toddler Cook Role Play Cute Baking Costume for Infants Photography Cooking Bakery Theme Party (Age: 10-24 Months)**XLSXEXCL**$9.77**41 rev7mo ago](https://www.amazon.com/dp/B0G37F9B99) [**Thorn Tree Kids Firefighter Outfit Short Sleeve T-Shirt Suspender Pants Overalls Halloween Birthday Outfits (Blue 18-24 Months)**Thorn Tree**$17.31**167 rev10mo ago](https://www.amazon.com/dp/B0FMYB6N25) [**Xuomuen Cowboy Costume Romper with Brown sheriff Hat Baby Dress Up Outfit Yellow and Blue 18-24 Months**Xuomuen**$19.41**121 rev11mo ago](https://www.amazon.com/dp/B0F3WXG48T) [**Baby Boy Girl Dinosaur Costume Cute Sleeveless Romper with Hat Newborn Infant Halloween Cosplay Clothes (Emerald 6-12 Months)**Dcohmch**$19.56**167 rev1y ago](https://www.amazon.com/dp/B0FFGTHML9) [**Rarjuiey Halloween Toddler Girl Outfit Boo Romper Spaghetti Strap Ghost Jumpsuit Bell Bottoms Outfits Spooky Clothes (Boo Ghost Black 18-24 Months)**Rarjuiey**$16.91**141 rev1y ago](https://www.amazon.com/dp/B0FBRSGHC7)
**~~View all new products →~~**
### **Trending**
90-day click momentum
[**Xuomuen Baby Boys Prince Charming Costume Medieval Royal Prince Dress up for Infant Boys Halloween Cosplay 12-18months**Xuomuen**$19.78**4.5★**▲ 270%**](https://www.amazon.com/dp/B0CQ8WRLJC) [**IWEMEK Baby Boy Race Car Driver Outfit 1st Birthday Party Fast One Birthday Outfit Kids Race Car Driver Romper Girls Boys Racer Jumpsuit Toddler Speed Racing Suit Cake Smash Photo Shoot Red-1Y**IWEMEK**$21.60**4.8★**▲ 270%**](https://www.amazon.com/dp/B0F32XH287) [**XLSXEXCL 2PCS Baby Chef Outfit Set Baby Apron and Chef Hat for Newborn Photography Toddler Cook Role Play Cute Baking Costume for Infants Photography Cooking Bakery Theme Party (Age: 10-24 Months)**XLSXEXCL**$9.77**4.6★**▲ 268%**](https://www.amazon.com/dp/B0G37F9B99) [**Marvel Spider-Man Miles Morales Infant Baby Boys Cosplay Romper 18 Months**Marvel**$22.03**4.8★**▲ 268%**](https://www.amazon.com/dp/B0CDJKCQYH) [**Born to Love Knuckleheads Kids Monkey Coverall Mechanic Photoshoot Overall for Boys & Girls Jumpsuit Baby Outfit (Red 2T)**Born to Love**$46.89**4.6★**▲ 265%**](https://www.amazon.com/dp/B00P8EBV7Y)
**~~View all trending →~~**
## **What buyers say about 18 month halloween costume girl**
What buyers praise and complain about, mined from review topics.
### **What buyers love **
**Size-Overall**35%
*“Good fit”*
**Quality-Overall**19%
*“High quality”*
**Soft Feel**8%
*“Soft and pictures shown are accurate”*
**Advertised Vs Actual Product**5%
*“is accurate to the picture”*
**Color**4%
*“Great color”*
**Comfort-Overall**4%
*“comfortable”*
**Value For Money**4%
*“Value for money”*
**Material Quality**3%
*“The material was lightweight”*
**Weight Light**3%
*“lightweight”*
**Zipper Quality**2%
*“The zipper feel fine”*
### **What buyers complain about **
**Size-Overall**25%
*“Cute runs small”*
**Smell**11%
*“Smelled awful”*
**Comfort-Overall**11%
*“Only very uncomfortable”*
**Value For Money**6%
*“Not worth the price”*
**Product Condition**6%
*“i believe I received a returned product”*
**Length**6%
*“A little long on my 22 month old”*
**Stretchability/Expandability/Elasticity**6%
*“its not super stretchy”*
### **Top return reasons **
**Size-Overall**71%
**Length**10%
**Material Quality**2%
**Advertised Vs Actual Product**2%
**Product Condition**2%
**Waist Fit**2%
**Quality-Overall**2%
**Sleeve Fit**1%
**Arm Fit**1%
**Defective Material/Parts**1%
## **Common questions**
- **Is 18 month halloween costume girl profitable to sell on Amazon United States?**
- The niche generates $0/yr across 24 tracked products. 0 of 3 products launched in the last 360 days are still selling. 90-day search growth is -17.2%. Flapen's verdict: Skip it (40/100).
- **How competitive is the 18 month halloween costume girl niche?**
- 20 brands and 25 sellers compete. The top 5 products take 34% of clicks and top 5 brands hold 39% of demand.
- **What do buyers complain about in 18 month halloween costume girl?**
- Top complaints mined from reviews: Size-Overall, Smell, Comfort-Overall. The return rate is 9.5% — above our launch gate.
- **When does demand for 18 month halloween costume girl peak?**
- Demand peaks in Sep–Oct; the busiest month runs 284.2× the quietest.
- **What does it cost to enter the 18 month halloween costume girl niche?**
- Listings span $9.77–$46.89; the average listing price is $22.58 (sweet spot $15–$100). The average incumbent carries 771 reviews — the moat a new listing must climb.
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